NMEA (protocole GPS) et VB6...
cs_Danette
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54
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mardi 23 juillet 2002
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16 septembre 2008
-
28 mai 2004 à 18:59
poemar Messages postés 1 Date d'inscription dimanche 30 septembre 2007 Statut Membre Dernière intervention 21 janvier 2008 - 21 janv. 2008 à 13:15
poemar Messages postés 1 Date d'inscription dimanche 30 septembre 2007 Statut Membre Dernière intervention 21 janvier 2008 - 21 janv. 2008 à 13:15
4 réponses
cs_ffbb
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5
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mardi 3 juin 2003
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15 décembre 2007
10 sept. 2004 à 11:52
10 sept. 2004 à 11:52
voici 2 sites qui répondent à ton post :
http://jools.free.fr/GPS/report/introduction.html
http://www.kh-gps.de/nmea-faq.htm
http://jools.free.fr/GPS/report/introduction.html
http://www.kh-gps.de/nmea-faq.htm
pompier0112
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9
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jeudi 9 novembre 2000
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12 septembre 2005
11 août 2005 à 20:44
11 août 2005 à 20:44
va voir le petit programme que j'ai mi en ligne il devrait répondre un epu a ce que tu veut.
abeking_mail
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13
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dimanche 22 mai 2005
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20 janvier 2010
24 nov. 2005 à 09:18
24 nov. 2005 à 09:18
salam
excellent tuoriel sur les trames NMEA ici: http://www.gpspassion.com/forumsen/topic.asp?TOPIC_ID=17661
Pour le parser (extraction des infos utiles de la trame) va voir ici:
http://www.codeproject.com/vb/net/WritingGPSApplications1.asp
Bonne chance et bon courage
excellent tuoriel sur les trames NMEA ici: http://www.gpspassion.com/forumsen/topic.asp?TOPIC_ID=17661
Pour le parser (extraction des infos utiles de la trame) va voir ici:
http://www.codeproject.com/vb/net/WritingGPSApplications1.asp
Bonne chance et bon courage
poemar
Messages postés
1
Date d'inscription
dimanche 30 septembre 2007
Statut
Membre
Dernière intervention
21 janvier 2008
21 janv. 2008 à 13:15
21 janv. 2008 à 13:15
ludo marine
voici une liste de phrase nmea avec leur donnée
Glenn Baddeley - GPS - NMEA sentence informationGlenn Baddeley - GPS - NMEA
sentence information
Contents
All $GPxxx sentence codes and short descriptions
26 interpreted sentences transmitted by GPS unit
12 interpreted Garmin proprietary sentences transmitted by GPS unit
8 interpreted Garmin proprietary sentences received by GPS unit
Format of latitudes and longitudes
References
[ Top ] [Glenn's GPS Contents Page]
All $GPxxx sentence codes and short descriptions
$GPAAM - Waypoint Arrival Alarm
$GPALM - GPS Almanac Data
$GPAPA - Autopilot format "A"
$GPAPB - Autopilot format "B"
$GPASD - Autopilot System Data
$GPBEC - Bearing & Distance to Waypoint, Dead Reckoning
$GPBOD - Bearing, Origin to Destination
$GPBWC - Bearing & Distance to Waypoint, Great Circle
$GPBWR - Bearing & Distance to Waypoint, Rhumb Line
$GPBWW - Bearing, Waypoint to Waypoint
$GPDBT - Depth Below Transducer
$GPDCN - Decca Position
$GPDPT - Depth
$GPFSI - Frequency Set Information
$GPGGA - Global Positioning System Fix Data
$GPGLC - Geographic Position, Loran-C
$GPGLL - Geographic Position, Latitude/Longitude
$GPGRS - GPS Range Residuals
$GPGSA - GPS DOP and Active Satellites
$GPGST - GPS Pseudorange Noise Statistics
$GPGSV - GPS Satellites in View
$GPGXA - TRANSIT Position
$GPHDG - Heading, Deviation & Variation
$GPHDT - Heading, True
$GPHSC - Heading Steering Command
$GPLCD - Loran-C Signal Data
$GPMSK - Control for a Beacon Receiver
$GPMSS - Beacon Receiver Status
$GPMTA - Air Temperature (to be phased out)
$GPMTW - Water Temperature
$GPMWD - Wind Direction
$GPMWV - Wind Speed and Angle
$GPOLN - Omega Lane Numbers
$GPOSD - Own Ship Data
$GPR00 - Waypoint active route (not standard)
$GPRMA - Recommended Minimum Specific Loran-C Data
$GPRMB - Recommended Minimum Navigation Information
$GPRMC - Recommended Minimum Specific GPS/TRANSIT Data
$GPROT - Rate of Turn
$GPRPM - Revolutions
$GPRSA - Rudder Sensor Angle
$GPRSD - RADAR System Data
$GPRTE - Routes
$GPSFI - Scanning Frequency Information
$GPSTN - Multiple Data ID
$GPTRF - Transit Fix Data
$GPTTM - Tracked Target Message
$GPVBW - Dual Ground/Water Speed
$GPVDR - Set and Drift
$GPVHW - Water Speed and Heading
$GPVLW - Distance Traveled through the Water
$GPVPW - Speed, Measured Parallel to Wind
$GPVTG - Track Made Good and Ground Speed
$GPWCV - Waypoint Closure Velocity
$GPWNC - Distance, Waypoint to Waypoint
$GPWPL - Waypoint Location
$GPXDR - Transducer Measurements
$GPXTE - Cross-Track Error, Measured
$GPXTR - Cross-Track Error, Dead Reckoning
$GPZDA - UTC Date / Time and Local Time Zone Offset
$GPZFO - UTC & Time from Origin Waypoint
$GPZTG - UTC & Time to Destination Waypoint
[Top]
26 interpreted sentences transmitted by GPS unit
$GPAAM - Waypoint Arrival Alarm
$GPALM - GPS Almanac Data (Can also be received by GPS unit)
$GPAPB - Autopilot format "B"
$GPBOD - Bearing, origin to destination
$GPBWC - Bearing and distance to waypoint, great circle
$GPGGA - Global Positioning System Fix Data
$GPGLL - Geographic position, latitude / longitude
$GPGRS - GPS Range Residuals
$GPGSA - GPS DOP and active satellites
$GPGST - GPS Pseudorange Noise Statistics
$GPGSV - GPS Satellites in view
$GPHDT - Heading, True
$GPMSK - Control for a Beacon Receiver
$GPMSS - Beacon Receiver Status
$GPR00 - List of waypoints in currently active route
$GPRMA - Recommended minimum specific Loran-C data
$GPRMB - Recommended minimum navigation info
$GPRMC - Recommended minimum specific GPS/Transit data
$GPRTE - Routes
$GPTRF - Transit Fix Data
$GPSTN - Multiple Data ID
$GPVBW - Dual Ground / Water Speed
$GPVTG - Track made good and ground speed
$GPWPL - Waypoint location
$GPXTE - Cross-track error, Measured
$GPZDA - UTC Date / Time and Local Time Zone Offset
There is a full list of $GPxxx sentence codes available, without links to format
details.
[Top]
$GPAAM
Waypoint Arrival Alarm
This sentence is generated by some units to indicate the Status of arrival
(entering the arrival circle, or passing the perpendicular of the course line)
at the destination waypoint.
$GPAAM,A,A,0.10,N,WPTNME*43
Where:
AAM Arrival Alarm
A Arrival circle entered
A Perpendicular passed
0.10 Circle radius
N Nautical miles
WPTNME Waypoint name
*43 Checksum data
$GPALM
GPS Almanac Data
A set of sentences transmitted by some Garmin units in response to a received
$PGRMO,GPALM,1 sentence. It can also be received by some GPS units (eg. Garmin
GPS 16 and GPS 17) to initialize the stored almanac information in the unit.
Example 1: $GPALM,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,*CC
1 = Total number of sentences in set
2 = Sentence sequence number in set
3 = Satellite number
4 = GPS week number
5 = Bits 17 to 24 of almanac page indicating SV health
6 = Eccentricity
7 = Reference time of almanac
8 = Inclination angle
9 = Right ascension rate
10 = Semi major axis route
11 = Argument of perigee (omega)
12 = Ascension node longitude
13 = Mean anomaly
14 = af0 clock parameter
15 = af1 clock parameter
Example 2:
$GPALM,1,1,15,1159,00,441d,4e,16be,fd5e,a10c9f,4a2da4,686e81,58cbe1,0a4,001*5B
FieldExampleComments
Sentence ID$GPALM
Number of messages1Total number of messages in sequence
Sequence number1This is first message in sequence
Satellite PRN15Unique ID (PRN) of satellite message relates to
GPS week number1159
SV health00Bits 17-24 of almanac page
Eccentricity441d
Reference time4eAlmanac reference time
Inclination angle16be
Rate of right ascensionfd5e
Roor of semi-major axisa10c9f
Argument of perigee4a2da4
Longitude of ascension node686e81
Mean anomoly58cbe1
F0 clock parameter0a4
F1 clock parameter001
Checksum*5B
$GPAPB
Autopilot format "B"
This sentence is sent by some GPS receivers to allow them to be used to control
an autopilot unit. This sentence is commonly used by autopilots and contains
navigation receiver warning flag status, cross-track-error, waypoint arrival
status, initial bearing from origin waypoint to the destination, continuous
bearing from present position to destination and recommended heading-to-steer to
destination waypoint for the active navigation leg of the journey.
Note: Some autopilots, Robertson in particular, misinterpret "bearing from
origin to destination" as "bearing from present position to destination". This
is likely due to the difference between the APB sentence and the APA sentence.
for the APA sentence this would be the correct thing to do for the data in the
same field. APA only differs from APB in this one field and APA leaves off the
last two fields where this distinction is clearly spelled out. This will result
in poor performance if the boat is sufficiently off-course that the two bearings
are different.
$GPAPB,A,A,0.10,R,N,V,V,011,M,DEST,011,M,011,M*82
where:
APB Autopilot format B
A Loran-C blink/SNR warning, general warning
A Loran-C cycle warning
0.10 cross-track error distance
R steer Right to correct (or L for Left)
N cross-track error units - nautical miles (K for kilometers)
V arrival alarm - circle
V arrival alarm - perpendicular
011,M magnetic bearing, origin to destination
DEST destination waypoint ID
011,M magnetic bearing, present position to destination
011,M magnetic heading to steer (bearings could True as 033,T)
$GPBOD
Bearing Origin to Destination
eg. BOD,045.,T,023.,M,DEST,START
045.,T bearing 045 degrees True from "START" to "DEST"
023.,M breaing 023 degrees Magnetic from "START" to "DEST"
DEST destination waypoint ID
START origin waypoint ID
Example 1: $GPBOD,099.3,T,105.6,M,POINTB,*01
Waypoint ID: "POINTB" Bearing 99.3 True, 105.6 Magnetic
This sentence is transmitted in the GOTO mode, without an active route on your
GPS. WARNING: this is the bearing from the moment you press enter in the GOTO
page to the destination waypoint and is NOT updated dynamically! To update the
information, (current bearing to waypoint), you will have to press enter in the
GOTO page again.
Example 2: $GPBOD,097.0,T,103.2,M,POINTB,POINTA*52
This sentence is transmitted when a route is active. It contains the active leg
information: origin waypoint "POINTA" and destination waypoint "POINTB", bearing
between the two points 97.0 True, 103.2 Magnetic. It does NOT display the
bearing from current location to destination waypoint! WARNING Again this
information does not change until you are on the next leg of the route. (The
bearing from POINTA to POINTB does not change during the time you are on this
leg.)
$GPBWC
Bearing and distance to waypoint, great circle
eg1. $GPBWC,081837,,,,,,T,,M,,N,*13
BWC,225444,4917.24,N,12309.57,W,051.9,T,031.6,M,001.3,N,004*29
225444 UTC time of fix 22:54:44
4917.24,N Latitude of waypoint
12309.57,W Longitude of waypoint
051.9,T Bearing to waypoint, degrees true
031.6,M Bearing to waypoint, degrees magnetic
001.3,N Distance to waypoint, Nautical miles
004 Waypoint ID
eg2. $GPBWC,220516,5130.02,N,00046.34,W,213.8,T,218.0,M,0004.6,N,EGLM*11
1 2 3 4 5 6 7 8 9 10 11 12 13
1 220516 timestamp
2 5130.02 Latitude of next waypoint
3 N North/South
4 00046.34 Longitude of next waypoint
5 W East/West
6 213.0 True track to waypoint
7 T True Track
8 218.0 Magnetic track to waypoint
9 M Magnetic
10 0004.6 range to waypoint
11 N unit of range to waypoint, N = Nautical miles
12 EGLM Waypoint name
13 *11 checksum
$GPGGA
Global Positioning System Fix Data
eg1. $GPGGA,170834,4124.8963,N,08151.6838,W,1,05,1.5,280.2,M,-34.0,M,,,*75
Name Example Data Description
Sentence Identifier$GPGGAGlobal Positioning System Fix Data
Time17083417:08:34 UTC
Latitude4124.8963, N41d 24.8963' N or 41d 24' 54" N
Longitude08151.6838, W81d 51.6838' W or 81d 51' 41" W
Fix Quality:
- 0 = Invalid
- 1 = GPS fix
- 2 = DGPS fix1Data is from a GPS fix
Number of Satellites055 Satellites are in view
Horizontal Dilution of Precision (HDOP)1.5Relative accuracy of horizontal
position
Altitude280.2, M280.2 meters above mean sea level
Height of geoid above WGS84 ellipsoid-34.0, M-34.0 meters
Time since last DGPS updateblankNo last update
DGPS reference station idblankNo station id
Checksum*75Used by program to check for transmission errors
Courtesy of Brian McClure, N8PQI.
Global Positioning System Fix Data. Time, position and fix related data for a
GPS receiver.
eg2. $GPGGA,hhmmss.ss,ddmm.mmm,a,dddmm.mmm,b,q,xx,p.p,a.b,M,c.d,M,x.x,nnnn
hhmmss.ss = UTC of position
ddmm.mmm = latitude of position
a = N or S, latitutde hemisphere
dddmm.mmm = longitude of position
b = E or W, longitude hemisphere
q = GPS Quality indicator (0=No fix, 1=Non-differential GPS fix, 2=Differential
GPS fix, 6=Estimated fix)
xx = number of satellites in use
p.p = horizontal dilution of precision
a.b = Antenna altitude above mean-sea-level
M = units of antenna altitude, meters
c.d = Geoidal height
M = units of geoidal height, meters
x.x = Age of Differential GPS data (seconds since last valid RTCM transmission)
nnnn = Differential reference station ID, 0000 to 1023
$GPGLL
Geographic Position, Latitude / Longitude and time.
eg1. $GPGLL,3751.65,S,14507.36,E*77
eg2. $GPGLL,4916.45,N,12311.12,W,225444,A
4916.46,N Latitude 49 deg. 16.45 min. North
12311.12,W Longitude 123 deg. 11.12 min. West
225444 Fix taken at 22:54:44 UTC
A Data valid
eg3. $GPGLL,5133.81,N,00042.25,W*75
1 2 3 4 5
1 5133.81 Current latitude
2 N North/South
3 00042.25 Current longitude
4 W East/West
5 *75 checksum
$--GLL,lll.ll,a,yyyyy.yy,a,hhmmss.ss,A llll.ll = Latitude of position
a = N or S
yyyyy.yy = Longitude of position
a = E or W
hhmmss.ss = UTC of position A status: A valid data
$GPGRS
GPS Range Residuals
Example: $GPGRS,024603.00,1,-1.8,-2.7,0.3,,,,,,,,,*6C
FieldExampleComments
Sentence ID$GPGRS
UTC Time024603.00UTC time of associated GGA fix Mode10 Residuals used in GGA, 1 residuals calculated after GGA
Sat 1 residual-1.8Residual (meters) of satellite 1 in solution
Sat 2 residual-2.7The order matches the PRN numbers in the GSA sentence
Sat 3 residual0.3
Sat 4 residual Unused entries are blank
Sat 5 residual
Sat 6 residual
Sat 7 residual
Sat 8 residual
Sat 9 residual
Sat 10 residual
Sat 11 residual
Sat 12 residual
Checksum*6C
$GPGSA
GPS DOP and active satellites
eg1. $GPGSA,A,3,,,,,,16,18,,22,24,,,3.6,2.1,2.2*3C
eg2. $GPGSA,A,3,19,28,14,18,27,22,31,39,,,,,1.7,1.0,1.3*34
1 = Mode:
M=Manual, forced to operate in 2D or 3D
A=Automatic, 3D/2D
2 = Mode:
1=Fix not available
2=2D
3=3D
3-14 = PRN's of Satellite Vechicles (SV's) used in position fix (null for unused fields)
15 = Position Dilution of Precision (PDOP)
16 = Horizontal Dilution of Precision (HDOP)
17 = Vertical Dilution of Precision (VDOP)
$GPGST
GPS Pseudorange Noise Statistics
Example: $GPGST,024603.00,3.2,6.6,4.7,47.3,5.8,5.6,22.0*58
Field ExampleComments
Sentence ID$GPGST
UTC Time024603.00UTC time of associated GGA fix
RMS deviation3.2Total RMS standard deviation of ranges inputs to the
navigation solution
Semi-major deviation6.6Standard deviation (meters) of semi-major axis of
error ellipse
Semi-minor deviation4.7Standard deviation (meters) of semi-minor axis of
error ellipse
Semi-major orientation47.3Orientation of semi-major axis of error ellipse
(true north degrees)
Latitude error deviation5.8Standard deviation (meters) of latitude error
Longitude error deviation5.6Standard deviation (meters) of longitude error
Altitude error deviation22.0Standard deviation (meters) of latitude error
Checksum*58
$GPGSV
GPS Satellites in view
eg. $GPGSV,3,1,11,03,03,111,00,04,15,270,00,06,01,010,00,13,06,292,00*74
$GPGSV,3,2,11,14,25,170,00,16,57,208,39,18,67,296,40,19,40,246,00*74
$GPGSV,3,3,11,22,42,067,42,24,14,311,43,27,05,244,00,,,,*4D
$GPGSV,1,1,13,02,02,213,,03,-3,000,,11,00,121,,14,13,172,05*62
1 = Total number of messages of this type in this cycle
2 = Message number
3 = Total number of SVs in view
4 = SV PRN number
5 = Elevation in degrees, 90 maximum
6 = Azimuth, degrees from true north, 000 to 359
7 = SNR, 00-99 dB (null when not tracking)
8-11 = Information about second SV, same as field 4-7
12-15= Information about third SV, same as field 4-7
16-19= Information about fourth SV, same as field 4-7
$GPHDT
Heading, True.
Actual vessel heading in degrees Ture produced by any device or system producing
true heading.
$--HDT,x.x,T
x.x = Heading, degrees True
$GPMSK
Control for a Beacon Receiver
$GPMSK,318.0,A,100,M,2*45
where:
318.0 Frequency to use
A Frequency mode, A=auto, M=manual
100 Beacon bit rate
M Bitrate, A=auto, M=manual
2 frequency for MSS message status (null for no status)
*45 checksum
$GPMSS
Beacon Receiver Status
Example 1: $GPMSS,55,27,318.0,100,*66
where:
55 signal strength in dB
27 signal to noise ratio in dB
318.0 Beacon Frequency in KHz
100 Beacon bitrate in bps
*66 checksum
Example 2: $GPMSS,0.0,0.0,0.0,25,2*6D
FieldExampleComments
Sentence ID$GPMSS
Signal strength0.0Signal strength (dB 1uV)
SNR0.0Signal to noise ratio (dB)
Frequency0.0Beacon frequency (kHz)
Data rate25Beacon data rate (BPS)
Unknown field2Unknown field sent by GPS receiver used for test
Checksum*6D
$GPR00
List of waypoint IDs in currently active route
eg1. $GPR00,EGLL,EGLM,EGTB,EGUB,EGTK,MBOT,EGTB,,,,,,,*58
eg2. $GPR00,MINST,CHATN,CHAT1,CHATW,CHATM,CHATE,003,004,005,006,007,,,*05
List of waypoints. This alternates with $GPWPL cycle
which itself cycles waypoints.
$GPRMA
Recommended minimum specific Loran-C data
eg. $GPRMA,A,lll,N,lll,W,x,y,ss.s,ccc,vv.v,W*hh
A = Data status
lll = Latitude
N = N/S
lll = longitude
S = W/E
x = not used
y = not used
ss.s = Speed over ground in knots
ccc = Course over ground
vv.v = Variation
W = Direction of variation E/W
hh = Checksum
$GPRMB
Recommended minimum navigation information (sent by nav. receiver when a
destination waypoint is active)
eg1. $GPRMB,A,0.66,L,003,004,4917.24,N,12309.57,W,001.3,052.5,000.5,V*0B
A Data status A OK, V warning
0.66,L Cross-track error (nautical miles, 9.9 max.),
steer Left to correct (or R = right)
003 Origin waypoint ID
004 Destination waypoint ID
4917.24,N Destination waypoint latitude 49 deg. 17.24 min. N
12309.57,W Destination waypoint longitude 123 deg. 09.57 min. W
001.3 Range to destination, nautical miles
052.5 True bearing to destination
000.5 Velocity towards destination, knots V Arrival alarm A arrived, V not arrived
*0B mandatory checksum
eg2. $GPRMB,A,4.08,L,EGLL,EGLM,5130.02,N,00046.34,W,004.6,213.9,122.9,A*3D
1 2 3 4 5 6 7 8 9 10 11 12 13
1 A validity
2 4.08 off track
3 L Steer Left (L/R)
4 EGLL last waypoint
5 EGLM next waypoint
6 5130.02 Latitude of Next waypoint
7 N North/South
8 00046.34 Longitude of next waypoint
9 W East/West
10 004.6 Range
11 213.9 bearing to waypt.
12 122.9 closing velocity
13 A validity
14 *3D checksum
eg3. $GPRMB,A,x.x,a,c--c,d--d,llll.ll,e,yyyyy.yy,f,g.g,h.h,i.i,j*kk
1 = Data Status (V=navigation receiver warning)
2 = Crosstrack error in nautical miles
3 = Direction to steer (L or R) to correct error
4 = Origin waypoint ID#
5 = Destination waypoint ID#
6 = Destination waypoint latitude
7 = N or S
8 = Destination waypoint longitude
9 = E or W
10 = Range to destination in nautical miles
11 = Bearing to destination, degrees True
12 = Destination closing velocity in knots
13 = Arrival status; (A=entered or perpendicular passed)
14 = Checksum
$GPRMC
Recommended minimum specific GPS/Transit data
eg1. $GPRMC,081836,A,3751.65,S,14507.36,E,000.0,360.0,130998,011.3,E*62
eg2. $GPRMC,225446,A,4916.45,N,12311.12,W,000.5,054.7,191194,020.3,E*68
225446 Time of fix 22:54:46 UTC A Navigation receiver warning A Valid position, V Warning
4916.45,N Latitude 49 deg. 16.45 min. North
12311.12,W Longitude 123 deg. 11.12 min. West
000.5 Speed over ground, Knots
054.7 Course Made Good, degrees true
191194 UTC Date of fix, 19 November 1994
020.3,E Magnetic variation, 20.3 deg. East
*68 mandatory checksum
eg3. $GPRMC,220516,A,5133.82,N,00042.24,W,173.8,231.8,130694,004.2,W*70
1 2 3 4 5 6 7 8 9 10 11 12
1 220516 Time Stamp
2 A validity - A-ok, V-invalid
3 5133.82 current Latitude
4 N North/South
5 00042.24 current Longitude
6 W East/West
7 173.8 Speed in knots
8 231.8 True course
9 130694 Date Stamp
10 004.2 Variation
11 W East/West
12 *70 checksum
eg4. for NMEA 0183 version 3.00 active the Mode indicator field is added
$GPRMC,hhmmss.ss,A,llll.ll,a,yyyyy.yy,a,x.x,x.x,ddmmyy,x.x,a,m*hh
Field #
1 = UTC time of fix
2 = Data status (A=Valid position, V=navigation receiver warning)
3 = Latitude of fix
4 = N or S of longitude
5 = Longitude of fix
6 = E or W of longitude
7 = Speed over ground in knots
8 = Track made good in degrees True
9 = UTC date of fix
10 = Magnetic variation degrees (Easterly var. subtracts from true course)
11 = E or W of magnetic variation
12 = Mode indicator, (A=Autonomous, D=Differential, E=Estimated, N=Data not valid)
13 = Checksum
$GPRTE
Routes
eg. $GPRTE,2,1,c,0,PBRCPK,PBRTO,PTELGR,PPLAND,PYAMBU,PPFAIR,PWARRN,PMORTL,PLISMR*73
$GPRTE,2,2,c,0,PCRESY,GRYRIE,GCORIO,GWERR,GWESTG,7FED*34
1 2 3 4 5 ..
Number of sentences in sequence
Sentence number 'c' Current active route, 'w' waypoint list starts with destination
waypoint
Name or number of the active route
onwards, Names of waypoints in Route
$GPTRF
Transit Fix Data
Time, date, position, and information related to a TRANSIT Fix.
$--TRF,hhmmss.ss,xxxxxx,llll.ll,a,yyyyy.yy,a,x.x,x.x,x.x,x.x,xxx
hhmmss.ss = UTC of position fix
xxxxxx = Date: dd/mm/yy
llll.ll,a = Latitude of position fix, N/S
yyyyy.yy,a = Longitude of position fix, E/W
x.x = Elevation angle
x.x = Number of iterations
x.x = Number of Doppler intervals
x.x = Update distance, nautical miles
x.x = Satellite ID
$GPSTN
Multiple Data ID.
This sentence is transmitted before each individual sentence where there is a
need for the Listener to determine the exact source of data in the system.
Examples might include dual-frequency depthsounding equipment or equipment that
integrates data from a number of sources and produces a single output.
$--STN,xx
xx = Talker ID number, 00 to 99
$GPVBW
Dual Ground / Water Speed
Water referenced and ground referenced speed data.
$--VBW,x.x,x.x,A,x.x,x.x,A
x.x = Longitudinal water speed, knots
x.x = Transverse water speed, knots A Status: Water speed, A Data valid
x.x = Longitudinal ground speed, knots
x.x = Transverse ground speed, knots A Status: Ground speed, A Data valid
$GPVTG
Track Made Good and Ground Speed.
eg1. $GPVTG,360.0,T,348.7,M,000.0,N,000.0,K*43
eg2. $GPVTG,054.7,T,034.4,M,005.5,N,010.2,K*41
054.7,T True course made good over ground, degrees
034.4,M Magnetic course made good over ground, degrees
005.5,N Ground speed, N=Knots
010.2,K Ground speed, K=Kilometers per hour
eg3. for NMEA 0183 version 3.00 active the Mode indicator field
is added at the end
$GPVTG,054.7,T,034.4,M,005.5,N,010.2,K,A*53
A Mode indicator (A=Autonomous, D=Differential,
E=Estimated, N=Data not valid)
$GPWPL
Waypoint location
eg1. $GPWPL,4917.16,N,12310.64,W,003*65
4917.16,N Latitude of waypoint
12310.64,W Longitude of waypoint
003 Waypoint ID
When a route is active, this sentence is sent once for each
waypoint in the route, in sequence. When all waypoints have
been reported, GPR00 is sent in the next data set. In any
group of sentences, only one WPL sentence, or an R00
sentence, will be sent.
eg2. $GPWPL,5128.62,N,00027.58,W,EGLL*59
1 2 3 4 5 6
1 5128.62 Latitude of nth waypoint on list
2 N North/South
3 00027.58 Longitude of nth waypoint
4 W East/West
5 EGLL Ident of nth waypoint
6 *59 checksum
$GPXTE
Cross Track Error, Measured
eg1. $GPXTE,A,A,0.67,L,N
A General warning flag V = warning
(Loran-C Blink or SNR warning)
A Not used for GPS (Loran-C cycle lock flag)
0.67 cross track error distance
L Steer left to correct error (or R for right)
N Distance units - Nautical miles
eg2. $GPXTE,A,A,4.07,L,N*6D
1 2 3 4 5 6
1 A validity
2 A cycle lock
3 4.07 distance off track
4 L steer left (L/R)
5 N distance units
6 *6D checksum
$GPZDA
UTC Date / Time and Local Time Zone Offset
Example 1: $GPZDA,hhmmss.ss,xx,xx,xxxx,xx,xx
hhmmss.ss = UTC
xx = Day, 01 to 31
xx = Month, 01 to 12
xxxx = Year
xx = Local zone description, 00 to +/- 13 hours
xx = Local zone minutes description (same sign as hours)
Example 2: $GPZDA,024611.08,25,03,2002,00,00*6A
FieldExampleComments
Sentence ID$GPZDA
UTC Time024611.08UTC time
UTC Day25UTC day (01 to 31)
UTC Month03UTC month (01 to 12)
UTC Year2002UTC year (4 digit format)
Local zone hours00Offset to local time zone in hours (+/- 00 to +/- 59)
Local zone minutes00Offset to local time zone in minutes (00 to 59)
Checksum*6A
[ Top ]
12 interpreted Garmin proprietary sentences transmitted by GPS unit
$HCHDG - Compass Heading
$PGRMB - DGPS Beacon Information
$PGRMC - Sensor Configuration Information
$PGRMC1 - Additional Sensor Configuration Information
$PGRME - Estimated Position Error
$PGRMF - GPS Position Fix Data
$PGRMI - Sensor Initialization Information
$PGRMM - Map Datum
$PGRMT - Sensor Status Information
$PGRMV - 3D Velocity Information
$PGRMZ - Altitude Information
$PSLIB - Tune DPGS Beacon Receiver
[Top]
$HCHDG
Compass Heading
This sentence is used on Garmin eTrex summit, Vista and GPS76S receivers to
output the value of the internal flux-gate compass. Only the magnetic heading
and magnetic variation is shown in the message.
$HCHDG,101.1,,,7.1,W*3C
where:
HCHDG Magnetic heading, deviation, variation
101.1 heading
,, deviation (no data)
7.1,W variation
$PGRMB
DGPS Beacon Information
$PGRMB,1,2,3,4,5,6,7,8,9*HH
1 = Tune frequency, Kilohertz (283.5 - 325.0 in 0.5 steps)
2 = Bit rate, Bits / second (0, 25, 50, 100, 200)
3 = SNR (Signal to Noise Ratio), 0 - 31
4 = Data Quality, 0 - 100
5 = Distance to beacon reference station
6 = Distance unit (K=Kilometres)
7 = Receiver communication status (0=Check wiring, 1=No signal, 2=Tuning,
3=Receiving, 4=Scanning)
8 = Fix source (R=RTCM, W=WAAS, N=Non-DPGS fix)
9 = DGPS Mode (A=Automatic, W=WAAS only, R=RTCM Only, N=None; DGPS disabled)
HH = Checksum
$PGRME
Estimated Position Error
eg. $PGRME,15.0,M,45.0,M,25.0,M*22
15.0,M Estimated horizontal position error (HPE), M=metres
45.0,M Estimated vertical position error (VPE), M=metres
25.0,M Overall spherical equivalent position error, M=metres
$PGRMF
GPS Position Fix Data
$PGRMF,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15*HH
1 = GPS week number
2 = GPS seconds in current week
3 = UTC date, ddmmyy format
4 = UTC time, hhmmss format
5 = GPS leap second count
6 = Latitude, dddmm.mmmm format
7 = Latitude hemisphere, N or S
8 = Longitude, dddmm.mmmm format
9 = Longitude hemisphere, E or W
10 = Mode (M=Manual, A=Automatic)
11 = Fix type (0=No fix, 1=2D fix, 2=3D fix)
12 = Speed over ground, kilometres / hour
13 = Course over ground, degrees true
14 = PDOP (Position dilution of precision), rounded to nearest integer
15 = TDOP (Time dilution of precision), rounded to nearest integer
HH = Checksum
$PGRMM
Map datum
Example 1: $PGRMM,Astrln Geod '66*51
'Astrln Geod 66' = Name of currently active datum
Example 2: $PGRMM,NAD27 Canada*2F
'NAD27 Canada' = Name of currently active datum
$PGRMT
Sensor Status Information
$PGRMT,1,2,3,4,5,6,7,8,9*HH
1 = Garmin product model and software version (eg. GPS 16 VER 2.10)
2 = ROM checksum test (P=Pass, F=Fail)
3 = Receiver failure discrete (P=Pass, F=Fail)
4 = Stored data lost (R=Retained, L=Lost)
5 = Real time clock lost (R=Retained, L=Lost)
6 = Oscillator drift discrete (P=Pass, F=Excessive drift detected)
7 = Data collection discrtete (C=Collecting, Null=Not Collecting)
8 = GPS sensor temperature (Degrees C)
9 = GPS sensor configuration data (R=Retained, L=Lost)
HH = Checksum
$PGRMV
3D Velocity Information
$PGRMV,1,2,3*HH
1 = True east velocity, metres / sec
2 = True north velocity, metres / sec
3 = Upward velocity, metres / sec
HH = Checksum
$PGRMZ
Altitude Information
eg1. $PGRMZ,246,f,3*1B
eg2. $PGRMZ,93,f,3*21
93,f Altitude in feet
3 Position fix dimensions 2 = user altitude
3 = GPS altitude
This sentence shows in feet, regardless of units shown on the display.
eg3. $PGRMZ,201,f,3*18
1 2 3
1 201 Altitude
2 F Units - f-Feet
3 checksum
$PSLIB
Tune DPGS Beacon Receiver
Proprietary Differential Control sentences to control a Starlink differential
beacon receiver, assuming Garmin's DBR is made by Starlink.
eg1. $PSLIB,290.5,100,J*22
eg2. $PSLIB,300.0,200,K*23
These two sentences are normally sent together in each group of sentences from
the GPS.
The three fields are: Frequency, bit Rate, Request Type. The value in the third field may be: J status request, K configuration request, blank = tuning
message.
When the GPS receiver is set to change the DBR frequency or baud rate, the "J"
sentence is replaced (just once) by (for example): $PSLIB,320.0,200*59 to set
the DBR to 320 KHz, 200 baud.
To tune a Garmin GBR 21, GBR 23 or equivalent beacon receiver.
$PSLIB,1,2*HH
1 = Beacon tune frequency, Kilohertz (283.5 - 325.0 in 0.5 steps)
2 = Beacon bit rate, Bits / second (0, 25, 50, 100, 200
HH = Checksum
[ Top ]
8 interpreted Garmin proprietary sentences received by GPS unit
$PGRMC - Sensor Configuration Information
$PGRMCE - Sensor Configuration Information Enquiry
$PGRMC1 - Additional Sensor Configuration Information
$PGRMC1E - Additional Sensor Configuration Information Enquiry
$PGRMI - Sensor Initialization Information
$PGRMIE - Sensor Initialization Information Enquiry
$PGRMO - Output Sentence Enable / Disable
$PSLIB - Tune DPGS Beacon Receiver
A few Garmin GPS receiver units are known to receive these sentences, including
the GPS 16 and GPS 17 modules.
[Top]
$PGRMC
Sensor Configuration Information
Used to configure the GPS sensor's operation. The GPS will also transmit this
sentence upon receiving this same sentence or the $PGRMCE sentence.
$PGRMC,1,2,3,4,5,6,7,8,9,10,11,12,13,14*HH
1 = Fix mode (A=Automatic, 2=2D exclusively; host system must supply altitude,
3=3D exclusively)
2 = Altitude above/below mean sea level, metres
3 = Earth datum index. If the user datum index is specified (96), fields 4 to 8
must contain valid values, otherwise they must be blank.
4 = Semi-major axis, metres, 0.001 metre resolution
5 = Inverse flattening factor, 285 to 310, 10e-9 resolution
6 = Delta X earth centred coordinate, metres, -5000 to 5000, 1 metre resolution
7 = Delta Y earth centred coordinate, metres, -5000 to 5000, 1 metre resolution
8 = Delta Z earth centred coordinate, metres, -5000 to 5000, 1 metre resolution
9 = Differential mode (A=Automatic; output DGPS fixes when available otherwise
non-DGPS, D=Only output differential fixes)
10 = NMEA 0183 baud rate (1=1200, 2=2400, 3=4800, 4=9600, 5=19200, 6=300, 7=600)
11 = Velocity filter (0=None, 1=Automatic, 2-255=Filter time constant; seconds)
12 = PPS mode (1=None, 2=1 Hertz)13 PPS pulse length, N 0 to 48. Length (milliseconds) = (N+1)*20
14 = Dead reckoning valid time, 1 to 30, seconds
HH = Checksum
$PGRMCE
Sensor Configuration Information Enquiry
The unit will respond by transmitting a $PGRMC sentence containing the current
default values.
$PGRMCE*HH
HH = Checksum
$PGRMC1
Additional Sensor Configuration Information
Used to configure additional aspects of the GPS sensor's operation. The GPS will
also transmit this sentence upon receiving this same sentence or the $PGRMC1E
sentence.
$PGRMC1,1,2,3,4,5,6,7,8,9*HH
1 = NMEA 0183 output time, 1-900, seconds (Not applicable to GPS16A)
2 = Binary phase output data (1=Off, 2=On)
3 = Position pinning (1=Off, 2=On)
4 = DGPS beacon frequency, Kilohertz, 283.5 to 325.0 in 0.5 steps
5 = DGPS beacon bit rate (0, 25, 50, 100, 200)
6 = DGPS beacon scanning (1=Off, 2=On)
7 = NMEA 0183 version 3.00 mode indicator (1=Off, 2=On)
8 = DGPS mode (A=Automatic, W=WAAS only, R=RTCM only, N=None; DGPS disabled)
9 = Power save mode (P=Activated, N=Normal)
HH = Checksum
$PGRMC1E
Additional Sensor Configuration Information Enquiry
The unit will respond by transmitting a $PGRMC1 sentence containing the current
default values.
$PGRMC1E*HH
HH = Checksum
$PGRMI
Sensor Initialization Information
Used to set the GPS sensor's set time and position and then commences satellite
acquisition. The GPS will also transmit this sentence upon receiving this same
sentence or the $PGRMIE sentence.
$PGRMI,1,2,3,4,5,6,7*HH
1 = Latitude, dddmm.mmm format
2 = Latitude hemisphere, N or S
3 = Longitude, dddmm.mmm format
4 = Longitude hemisphere, N or S
5 = Current UTC date, ddmmyy format
6 = Current UTC time, hhmmss format
7 = Receiver command (A=Auto locate, R=Unit reset)
HH = Checksum
$PGRMIE
Sensor Initialization Information Enquiry
The unit will respond by transmitting a $PGRMI sentence containing the current
default values.
$PGRMIE*HH
HH = Checksum
$PGRMO
Output Sentence Enable / Disable
$PGRMO,xxxxx,n*HH
xxxxx = Target sentence name (eg. GPGGA, GPGSA)
n = Target mode (0=Disable specified sentence, 1=Enable specified sentence,
2=Disable all output sentences except PSLIB, 3=Enable all output sentences
except GPALM, 4=Restore factory defaults)
HH = Checksum
[ Top ]
Format of latitudes and longitudes
Where a numeric latitude or longitude is given, the two digits immediately to
the left of the decimal point are whole minutes, to the right are decimals of
minutes, and the remaining digits to the left of the whole minutes are whole
degrees.
eg. 4533.35 is 45 degrees and 33.35 minutes. ".35" of a minute is exactly 21
seconds.
eg. 16708.033 is 167 degrees and 8.033 minutes. ".033" of a minute is about 2
seconds.
[ Top ]
References
This information on NMEA sentences has been sourced from all over the 'net and I
make no apologies for any inaccuracies or errors. Still, it's useful stuff. I
wish to thank all the sources, which are listed on my GPS Links page. Please
contact me if you know of freely available interpretations of sentences which
are not on this page.
[Top]
Copyright © Glenn Baddeley 2003
http://home.pacific.net.au/~gnb/gps/nmea.html was last updated 29 Sep 2003.
voici une liste de phrase nmea avec leur donnée
Glenn Baddeley - GPS - NMEA sentence informationGlenn Baddeley - GPS - NMEA
sentence information
Contents
All $GPxxx sentence codes and short descriptions
26 interpreted sentences transmitted by GPS unit
12 interpreted Garmin proprietary sentences transmitted by GPS unit
8 interpreted Garmin proprietary sentences received by GPS unit
Format of latitudes and longitudes
References
[ Top ] [Glenn's GPS Contents Page]
All $GPxxx sentence codes and short descriptions
$GPAAM - Waypoint Arrival Alarm
$GPALM - GPS Almanac Data
$GPAPA - Autopilot format "A"
$GPAPB - Autopilot format "B"
$GPASD - Autopilot System Data
$GPBEC - Bearing & Distance to Waypoint, Dead Reckoning
$GPBOD - Bearing, Origin to Destination
$GPBWC - Bearing & Distance to Waypoint, Great Circle
$GPBWR - Bearing & Distance to Waypoint, Rhumb Line
$GPBWW - Bearing, Waypoint to Waypoint
$GPDBT - Depth Below Transducer
$GPDCN - Decca Position
$GPDPT - Depth
$GPFSI - Frequency Set Information
$GPGGA - Global Positioning System Fix Data
$GPGLC - Geographic Position, Loran-C
$GPGLL - Geographic Position, Latitude/Longitude
$GPGRS - GPS Range Residuals
$GPGSA - GPS DOP and Active Satellites
$GPGST - GPS Pseudorange Noise Statistics
$GPGSV - GPS Satellites in View
$GPGXA - TRANSIT Position
$GPHDG - Heading, Deviation & Variation
$GPHDT - Heading, True
$GPHSC - Heading Steering Command
$GPLCD - Loran-C Signal Data
$GPMSK - Control for a Beacon Receiver
$GPMSS - Beacon Receiver Status
$GPMTA - Air Temperature (to be phased out)
$GPMTW - Water Temperature
$GPMWD - Wind Direction
$GPMWV - Wind Speed and Angle
$GPOLN - Omega Lane Numbers
$GPOSD - Own Ship Data
$GPR00 - Waypoint active route (not standard)
$GPRMA - Recommended Minimum Specific Loran-C Data
$GPRMB - Recommended Minimum Navigation Information
$GPRMC - Recommended Minimum Specific GPS/TRANSIT Data
$GPROT - Rate of Turn
$GPRPM - Revolutions
$GPRSA - Rudder Sensor Angle
$GPRSD - RADAR System Data
$GPRTE - Routes
$GPSFI - Scanning Frequency Information
$GPSTN - Multiple Data ID
$GPTRF - Transit Fix Data
$GPTTM - Tracked Target Message
$GPVBW - Dual Ground/Water Speed
$GPVDR - Set and Drift
$GPVHW - Water Speed and Heading
$GPVLW - Distance Traveled through the Water
$GPVPW - Speed, Measured Parallel to Wind
$GPVTG - Track Made Good and Ground Speed
$GPWCV - Waypoint Closure Velocity
$GPWNC - Distance, Waypoint to Waypoint
$GPWPL - Waypoint Location
$GPXDR - Transducer Measurements
$GPXTE - Cross-Track Error, Measured
$GPXTR - Cross-Track Error, Dead Reckoning
$GPZDA - UTC Date / Time and Local Time Zone Offset
$GPZFO - UTC & Time from Origin Waypoint
$GPZTG - UTC & Time to Destination Waypoint
[Top]
26 interpreted sentences transmitted by GPS unit
$GPAAM - Waypoint Arrival Alarm
$GPALM - GPS Almanac Data (Can also be received by GPS unit)
$GPAPB - Autopilot format "B"
$GPBOD - Bearing, origin to destination
$GPBWC - Bearing and distance to waypoint, great circle
$GPGGA - Global Positioning System Fix Data
$GPGLL - Geographic position, latitude / longitude
$GPGRS - GPS Range Residuals
$GPGSA - GPS DOP and active satellites
$GPGST - GPS Pseudorange Noise Statistics
$GPGSV - GPS Satellites in view
$GPHDT - Heading, True
$GPMSK - Control for a Beacon Receiver
$GPMSS - Beacon Receiver Status
$GPR00 - List of waypoints in currently active route
$GPRMA - Recommended minimum specific Loran-C data
$GPRMB - Recommended minimum navigation info
$GPRMC - Recommended minimum specific GPS/Transit data
$GPRTE - Routes
$GPTRF - Transit Fix Data
$GPSTN - Multiple Data ID
$GPVBW - Dual Ground / Water Speed
$GPVTG - Track made good and ground speed
$GPWPL - Waypoint location
$GPXTE - Cross-track error, Measured
$GPZDA - UTC Date / Time and Local Time Zone Offset
There is a full list of $GPxxx sentence codes available, without links to format
details.
[Top]
$GPAAM
Waypoint Arrival Alarm
This sentence is generated by some units to indicate the Status of arrival
(entering the arrival circle, or passing the perpendicular of the course line)
at the destination waypoint.
$GPAAM,A,A,0.10,N,WPTNME*43
Where:
AAM Arrival Alarm
A Arrival circle entered
A Perpendicular passed
0.10 Circle radius
N Nautical miles
WPTNME Waypoint name
*43 Checksum data
$GPALM
GPS Almanac Data
A set of sentences transmitted by some Garmin units in response to a received
$PGRMO,GPALM,1 sentence. It can also be received by some GPS units (eg. Garmin
GPS 16 and GPS 17) to initialize the stored almanac information in the unit.
Example 1: $GPALM,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,*CC
1 = Total number of sentences in set
2 = Sentence sequence number in set
3 = Satellite number
4 = GPS week number
5 = Bits 17 to 24 of almanac page indicating SV health
6 = Eccentricity
7 = Reference time of almanac
8 = Inclination angle
9 = Right ascension rate
10 = Semi major axis route
11 = Argument of perigee (omega)
12 = Ascension node longitude
13 = Mean anomaly
14 = af0 clock parameter
15 = af1 clock parameter
Example 2:
$GPALM,1,1,15,1159,00,441d,4e,16be,fd5e,a10c9f,4a2da4,686e81,58cbe1,0a4,001*5B
FieldExampleComments
Sentence ID$GPALM
Number of messages1Total number of messages in sequence
Sequence number1This is first message in sequence
Satellite PRN15Unique ID (PRN) of satellite message relates to
GPS week number1159
SV health00Bits 17-24 of almanac page
Eccentricity441d
Reference time4eAlmanac reference time
Inclination angle16be
Rate of right ascensionfd5e
Roor of semi-major axisa10c9f
Argument of perigee4a2da4
Longitude of ascension node686e81
Mean anomoly58cbe1
F0 clock parameter0a4
F1 clock parameter001
Checksum*5B
$GPAPB
Autopilot format "B"
This sentence is sent by some GPS receivers to allow them to be used to control
an autopilot unit. This sentence is commonly used by autopilots and contains
navigation receiver warning flag status, cross-track-error, waypoint arrival
status, initial bearing from origin waypoint to the destination, continuous
bearing from present position to destination and recommended heading-to-steer to
destination waypoint for the active navigation leg of the journey.
Note: Some autopilots, Robertson in particular, misinterpret "bearing from
origin to destination" as "bearing from present position to destination". This
is likely due to the difference between the APB sentence and the APA sentence.
for the APA sentence this would be the correct thing to do for the data in the
same field. APA only differs from APB in this one field and APA leaves off the
last two fields where this distinction is clearly spelled out. This will result
in poor performance if the boat is sufficiently off-course that the two bearings
are different.
$GPAPB,A,A,0.10,R,N,V,V,011,M,DEST,011,M,011,M*82
where:
APB Autopilot format B
A Loran-C blink/SNR warning, general warning
A Loran-C cycle warning
0.10 cross-track error distance
R steer Right to correct (or L for Left)
N cross-track error units - nautical miles (K for kilometers)
V arrival alarm - circle
V arrival alarm - perpendicular
011,M magnetic bearing, origin to destination
DEST destination waypoint ID
011,M magnetic bearing, present position to destination
011,M magnetic heading to steer (bearings could True as 033,T)
$GPBOD
Bearing Origin to Destination
eg. BOD,045.,T,023.,M,DEST,START
045.,T bearing 045 degrees True from "START" to "DEST"
023.,M breaing 023 degrees Magnetic from "START" to "DEST"
DEST destination waypoint ID
START origin waypoint ID
Example 1: $GPBOD,099.3,T,105.6,M,POINTB,*01
Waypoint ID: "POINTB" Bearing 99.3 True, 105.6 Magnetic
This sentence is transmitted in the GOTO mode, without an active route on your
GPS. WARNING: this is the bearing from the moment you press enter in the GOTO
page to the destination waypoint and is NOT updated dynamically! To update the
information, (current bearing to waypoint), you will have to press enter in the
GOTO page again.
Example 2: $GPBOD,097.0,T,103.2,M,POINTB,POINTA*52
This sentence is transmitted when a route is active. It contains the active leg
information: origin waypoint "POINTA" and destination waypoint "POINTB", bearing
between the two points 97.0 True, 103.2 Magnetic. It does NOT display the
bearing from current location to destination waypoint! WARNING Again this
information does not change until you are on the next leg of the route. (The
bearing from POINTA to POINTB does not change during the time you are on this
leg.)
$GPBWC
Bearing and distance to waypoint, great circle
eg1. $GPBWC,081837,,,,,,T,,M,,N,*13
BWC,225444,4917.24,N,12309.57,W,051.9,T,031.6,M,001.3,N,004*29
225444 UTC time of fix 22:54:44
4917.24,N Latitude of waypoint
12309.57,W Longitude of waypoint
051.9,T Bearing to waypoint, degrees true
031.6,M Bearing to waypoint, degrees magnetic
001.3,N Distance to waypoint, Nautical miles
004 Waypoint ID
eg2. $GPBWC,220516,5130.02,N,00046.34,W,213.8,T,218.0,M,0004.6,N,EGLM*11
1 2 3 4 5 6 7 8 9 10 11 12 13
1 220516 timestamp
2 5130.02 Latitude of next waypoint
3 N North/South
4 00046.34 Longitude of next waypoint
5 W East/West
6 213.0 True track to waypoint
7 T True Track
8 218.0 Magnetic track to waypoint
9 M Magnetic
10 0004.6 range to waypoint
11 N unit of range to waypoint, N = Nautical miles
12 EGLM Waypoint name
13 *11 checksum
$GPGGA
Global Positioning System Fix Data
eg1. $GPGGA,170834,4124.8963,N,08151.6838,W,1,05,1.5,280.2,M,-34.0,M,,,*75
Name Example Data Description
Sentence Identifier$GPGGAGlobal Positioning System Fix Data
Time17083417:08:34 UTC
Latitude4124.8963, N41d 24.8963' N or 41d 24' 54" N
Longitude08151.6838, W81d 51.6838' W or 81d 51' 41" W
Fix Quality:
- 0 = Invalid
- 1 = GPS fix
- 2 = DGPS fix1Data is from a GPS fix
Number of Satellites055 Satellites are in view
Horizontal Dilution of Precision (HDOP)1.5Relative accuracy of horizontal
position
Altitude280.2, M280.2 meters above mean sea level
Height of geoid above WGS84 ellipsoid-34.0, M-34.0 meters
Time since last DGPS updateblankNo last update
DGPS reference station idblankNo station id
Checksum*75Used by program to check for transmission errors
Courtesy of Brian McClure, N8PQI.
Global Positioning System Fix Data. Time, position and fix related data for a
GPS receiver.
eg2. $GPGGA,hhmmss.ss,ddmm.mmm,a,dddmm.mmm,b,q,xx,p.p,a.b,M,c.d,M,x.x,nnnn
hhmmss.ss = UTC of position
ddmm.mmm = latitude of position
a = N or S, latitutde hemisphere
dddmm.mmm = longitude of position
b = E or W, longitude hemisphere
q = GPS Quality indicator (0=No fix, 1=Non-differential GPS fix, 2=Differential
GPS fix, 6=Estimated fix)
xx = number of satellites in use
p.p = horizontal dilution of precision
a.b = Antenna altitude above mean-sea-level
M = units of antenna altitude, meters
c.d = Geoidal height
M = units of geoidal height, meters
x.x = Age of Differential GPS data (seconds since last valid RTCM transmission)
nnnn = Differential reference station ID, 0000 to 1023
$GPGLL
Geographic Position, Latitude / Longitude and time.
eg1. $GPGLL,3751.65,S,14507.36,E*77
eg2. $GPGLL,4916.45,N,12311.12,W,225444,A
4916.46,N Latitude 49 deg. 16.45 min. North
12311.12,W Longitude 123 deg. 11.12 min. West
225444 Fix taken at 22:54:44 UTC
A Data valid
eg3. $GPGLL,5133.81,N,00042.25,W*75
1 2 3 4 5
1 5133.81 Current latitude
2 N North/South
3 00042.25 Current longitude
4 W East/West
5 *75 checksum
$--GLL,lll.ll,a,yyyyy.yy,a,hhmmss.ss,A llll.ll = Latitude of position
a = N or S
yyyyy.yy = Longitude of position
a = E or W
hhmmss.ss = UTC of position A status: A valid data
$GPGRS
GPS Range Residuals
Example: $GPGRS,024603.00,1,-1.8,-2.7,0.3,,,,,,,,,*6C
FieldExampleComments
Sentence ID$GPGRS
UTC Time024603.00UTC time of associated GGA fix Mode10 Residuals used in GGA, 1 residuals calculated after GGA
Sat 1 residual-1.8Residual (meters) of satellite 1 in solution
Sat 2 residual-2.7The order matches the PRN numbers in the GSA sentence
Sat 3 residual0.3
Sat 4 residual Unused entries are blank
Sat 5 residual
Sat 6 residual
Sat 7 residual
Sat 8 residual
Sat 9 residual
Sat 10 residual
Sat 11 residual
Sat 12 residual
Checksum*6C
$GPGSA
GPS DOP and active satellites
eg1. $GPGSA,A,3,,,,,,16,18,,22,24,,,3.6,2.1,2.2*3C
eg2. $GPGSA,A,3,19,28,14,18,27,22,31,39,,,,,1.7,1.0,1.3*34
1 = Mode:
M=Manual, forced to operate in 2D or 3D
A=Automatic, 3D/2D
2 = Mode:
1=Fix not available
2=2D
3=3D
3-14 = PRN's of Satellite Vechicles (SV's) used in position fix (null for unused fields)
15 = Position Dilution of Precision (PDOP)
16 = Horizontal Dilution of Precision (HDOP)
17 = Vertical Dilution of Precision (VDOP)
$GPGST
GPS Pseudorange Noise Statistics
Example: $GPGST,024603.00,3.2,6.6,4.7,47.3,5.8,5.6,22.0*58
Field ExampleComments
Sentence ID$GPGST
UTC Time024603.00UTC time of associated GGA fix
RMS deviation3.2Total RMS standard deviation of ranges inputs to the
navigation solution
Semi-major deviation6.6Standard deviation (meters) of semi-major axis of
error ellipse
Semi-minor deviation4.7Standard deviation (meters) of semi-minor axis of
error ellipse
Semi-major orientation47.3Orientation of semi-major axis of error ellipse
(true north degrees)
Latitude error deviation5.8Standard deviation (meters) of latitude error
Longitude error deviation5.6Standard deviation (meters) of longitude error
Altitude error deviation22.0Standard deviation (meters) of latitude error
Checksum*58
$GPGSV
GPS Satellites in view
eg. $GPGSV,3,1,11,03,03,111,00,04,15,270,00,06,01,010,00,13,06,292,00*74
$GPGSV,3,2,11,14,25,170,00,16,57,208,39,18,67,296,40,19,40,246,00*74
$GPGSV,3,3,11,22,42,067,42,24,14,311,43,27,05,244,00,,,,*4D
$GPGSV,1,1,13,02,02,213,,03,-3,000,,11,00,121,,14,13,172,05*62
1 = Total number of messages of this type in this cycle
2 = Message number
3 = Total number of SVs in view
4 = SV PRN number
5 = Elevation in degrees, 90 maximum
6 = Azimuth, degrees from true north, 000 to 359
7 = SNR, 00-99 dB (null when not tracking)
8-11 = Information about second SV, same as field 4-7
12-15= Information about third SV, same as field 4-7
16-19= Information about fourth SV, same as field 4-7
$GPHDT
Heading, True.
Actual vessel heading in degrees Ture produced by any device or system producing
true heading.
$--HDT,x.x,T
x.x = Heading, degrees True
$GPMSK
Control for a Beacon Receiver
$GPMSK,318.0,A,100,M,2*45
where:
318.0 Frequency to use
A Frequency mode, A=auto, M=manual
100 Beacon bit rate
M Bitrate, A=auto, M=manual
2 frequency for MSS message status (null for no status)
*45 checksum
$GPMSS
Beacon Receiver Status
Example 1: $GPMSS,55,27,318.0,100,*66
where:
55 signal strength in dB
27 signal to noise ratio in dB
318.0 Beacon Frequency in KHz
100 Beacon bitrate in bps
*66 checksum
Example 2: $GPMSS,0.0,0.0,0.0,25,2*6D
FieldExampleComments
Sentence ID$GPMSS
Signal strength0.0Signal strength (dB 1uV)
SNR0.0Signal to noise ratio (dB)
Frequency0.0Beacon frequency (kHz)
Data rate25Beacon data rate (BPS)
Unknown field2Unknown field sent by GPS receiver used for test
Checksum*6D
$GPR00
List of waypoint IDs in currently active route
eg1. $GPR00,EGLL,EGLM,EGTB,EGUB,EGTK,MBOT,EGTB,,,,,,,*58
eg2. $GPR00,MINST,CHATN,CHAT1,CHATW,CHATM,CHATE,003,004,005,006,007,,,*05
List of waypoints. This alternates with $GPWPL cycle
which itself cycles waypoints.
$GPRMA
Recommended minimum specific Loran-C data
eg. $GPRMA,A,lll,N,lll,W,x,y,ss.s,ccc,vv.v,W*hh
A = Data status
lll = Latitude
N = N/S
lll = longitude
S = W/E
x = not used
y = not used
ss.s = Speed over ground in knots
ccc = Course over ground
vv.v = Variation
W = Direction of variation E/W
hh = Checksum
$GPRMB
Recommended minimum navigation information (sent by nav. receiver when a
destination waypoint is active)
eg1. $GPRMB,A,0.66,L,003,004,4917.24,N,12309.57,W,001.3,052.5,000.5,V*0B
A Data status A OK, V warning
0.66,L Cross-track error (nautical miles, 9.9 max.),
steer Left to correct (or R = right)
003 Origin waypoint ID
004 Destination waypoint ID
4917.24,N Destination waypoint latitude 49 deg. 17.24 min. N
12309.57,W Destination waypoint longitude 123 deg. 09.57 min. W
001.3 Range to destination, nautical miles
052.5 True bearing to destination
000.5 Velocity towards destination, knots V Arrival alarm A arrived, V not arrived
*0B mandatory checksum
eg2. $GPRMB,A,4.08,L,EGLL,EGLM,5130.02,N,00046.34,W,004.6,213.9,122.9,A*3D
1 2 3 4 5 6 7 8 9 10 11 12 13
1 A validity
2 4.08 off track
3 L Steer Left (L/R)
4 EGLL last waypoint
5 EGLM next waypoint
6 5130.02 Latitude of Next waypoint
7 N North/South
8 00046.34 Longitude of next waypoint
9 W East/West
10 004.6 Range
11 213.9 bearing to waypt.
12 122.9 closing velocity
13 A validity
14 *3D checksum
eg3. $GPRMB,A,x.x,a,c--c,d--d,llll.ll,e,yyyyy.yy,f,g.g,h.h,i.i,j*kk
1 = Data Status (V=navigation receiver warning)
2 = Crosstrack error in nautical miles
3 = Direction to steer (L or R) to correct error
4 = Origin waypoint ID#
5 = Destination waypoint ID#
6 = Destination waypoint latitude
7 = N or S
8 = Destination waypoint longitude
9 = E or W
10 = Range to destination in nautical miles
11 = Bearing to destination, degrees True
12 = Destination closing velocity in knots
13 = Arrival status; (A=entered or perpendicular passed)
14 = Checksum
$GPRMC
Recommended minimum specific GPS/Transit data
eg1. $GPRMC,081836,A,3751.65,S,14507.36,E,000.0,360.0,130998,011.3,E*62
eg2. $GPRMC,225446,A,4916.45,N,12311.12,W,000.5,054.7,191194,020.3,E*68
225446 Time of fix 22:54:46 UTC A Navigation receiver warning A Valid position, V Warning
4916.45,N Latitude 49 deg. 16.45 min. North
12311.12,W Longitude 123 deg. 11.12 min. West
000.5 Speed over ground, Knots
054.7 Course Made Good, degrees true
191194 UTC Date of fix, 19 November 1994
020.3,E Magnetic variation, 20.3 deg. East
*68 mandatory checksum
eg3. $GPRMC,220516,A,5133.82,N,00042.24,W,173.8,231.8,130694,004.2,W*70
1 2 3 4 5 6 7 8 9 10 11 12
1 220516 Time Stamp
2 A validity - A-ok, V-invalid
3 5133.82 current Latitude
4 N North/South
5 00042.24 current Longitude
6 W East/West
7 173.8 Speed in knots
8 231.8 True course
9 130694 Date Stamp
10 004.2 Variation
11 W East/West
12 *70 checksum
eg4. for NMEA 0183 version 3.00 active the Mode indicator field is added
$GPRMC,hhmmss.ss,A,llll.ll,a,yyyyy.yy,a,x.x,x.x,ddmmyy,x.x,a,m*hh
Field #
1 = UTC time of fix
2 = Data status (A=Valid position, V=navigation receiver warning)
3 = Latitude of fix
4 = N or S of longitude
5 = Longitude of fix
6 = E or W of longitude
7 = Speed over ground in knots
8 = Track made good in degrees True
9 = UTC date of fix
10 = Magnetic variation degrees (Easterly var. subtracts from true course)
11 = E or W of magnetic variation
12 = Mode indicator, (A=Autonomous, D=Differential, E=Estimated, N=Data not valid)
13 = Checksum
$GPRTE
Routes
eg. $GPRTE,2,1,c,0,PBRCPK,PBRTO,PTELGR,PPLAND,PYAMBU,PPFAIR,PWARRN,PMORTL,PLISMR*73
$GPRTE,2,2,c,0,PCRESY,GRYRIE,GCORIO,GWERR,GWESTG,7FED*34
1 2 3 4 5 ..
Number of sentences in sequence
Sentence number 'c' Current active route, 'w' waypoint list starts with destination
waypoint
Name or number of the active route
onwards, Names of waypoints in Route
$GPTRF
Transit Fix Data
Time, date, position, and information related to a TRANSIT Fix.
$--TRF,hhmmss.ss,xxxxxx,llll.ll,a,yyyyy.yy,a,x.x,x.x,x.x,x.x,xxx
hhmmss.ss = UTC of position fix
xxxxxx = Date: dd/mm/yy
llll.ll,a = Latitude of position fix, N/S
yyyyy.yy,a = Longitude of position fix, E/W
x.x = Elevation angle
x.x = Number of iterations
x.x = Number of Doppler intervals
x.x = Update distance, nautical miles
x.x = Satellite ID
$GPSTN
Multiple Data ID.
This sentence is transmitted before each individual sentence where there is a
need for the Listener to determine the exact source of data in the system.
Examples might include dual-frequency depthsounding equipment or equipment that
integrates data from a number of sources and produces a single output.
$--STN,xx
xx = Talker ID number, 00 to 99
$GPVBW
Dual Ground / Water Speed
Water referenced and ground referenced speed data.
$--VBW,x.x,x.x,A,x.x,x.x,A
x.x = Longitudinal water speed, knots
x.x = Transverse water speed, knots A Status: Water speed, A Data valid
x.x = Longitudinal ground speed, knots
x.x = Transverse ground speed, knots A Status: Ground speed, A Data valid
$GPVTG
Track Made Good and Ground Speed.
eg1. $GPVTG,360.0,T,348.7,M,000.0,N,000.0,K*43
eg2. $GPVTG,054.7,T,034.4,M,005.5,N,010.2,K*41
054.7,T True course made good over ground, degrees
034.4,M Magnetic course made good over ground, degrees
005.5,N Ground speed, N=Knots
010.2,K Ground speed, K=Kilometers per hour
eg3. for NMEA 0183 version 3.00 active the Mode indicator field
is added at the end
$GPVTG,054.7,T,034.4,M,005.5,N,010.2,K,A*53
A Mode indicator (A=Autonomous, D=Differential,
E=Estimated, N=Data not valid)
$GPWPL
Waypoint location
eg1. $GPWPL,4917.16,N,12310.64,W,003*65
4917.16,N Latitude of waypoint
12310.64,W Longitude of waypoint
003 Waypoint ID
When a route is active, this sentence is sent once for each
waypoint in the route, in sequence. When all waypoints have
been reported, GPR00 is sent in the next data set. In any
group of sentences, only one WPL sentence, or an R00
sentence, will be sent.
eg2. $GPWPL,5128.62,N,00027.58,W,EGLL*59
1 2 3 4 5 6
1 5128.62 Latitude of nth waypoint on list
2 N North/South
3 00027.58 Longitude of nth waypoint
4 W East/West
5 EGLL Ident of nth waypoint
6 *59 checksum
$GPXTE
Cross Track Error, Measured
eg1. $GPXTE,A,A,0.67,L,N
A General warning flag V = warning
(Loran-C Blink or SNR warning)
A Not used for GPS (Loran-C cycle lock flag)
0.67 cross track error distance
L Steer left to correct error (or R for right)
N Distance units - Nautical miles
eg2. $GPXTE,A,A,4.07,L,N*6D
1 2 3 4 5 6
1 A validity
2 A cycle lock
3 4.07 distance off track
4 L steer left (L/R)
5 N distance units
6 *6D checksum
$GPZDA
UTC Date / Time and Local Time Zone Offset
Example 1: $GPZDA,hhmmss.ss,xx,xx,xxxx,xx,xx
hhmmss.ss = UTC
xx = Day, 01 to 31
xx = Month, 01 to 12
xxxx = Year
xx = Local zone description, 00 to +/- 13 hours
xx = Local zone minutes description (same sign as hours)
Example 2: $GPZDA,024611.08,25,03,2002,00,00*6A
FieldExampleComments
Sentence ID$GPZDA
UTC Time024611.08UTC time
UTC Day25UTC day (01 to 31)
UTC Month03UTC month (01 to 12)
UTC Year2002UTC year (4 digit format)
Local zone hours00Offset to local time zone in hours (+/- 00 to +/- 59)
Local zone minutes00Offset to local time zone in minutes (00 to 59)
Checksum*6A
[ Top ]
12 interpreted Garmin proprietary sentences transmitted by GPS unit
$HCHDG - Compass Heading
$PGRMB - DGPS Beacon Information
$PGRMC - Sensor Configuration Information
$PGRMC1 - Additional Sensor Configuration Information
$PGRME - Estimated Position Error
$PGRMF - GPS Position Fix Data
$PGRMI - Sensor Initialization Information
$PGRMM - Map Datum
$PGRMT - Sensor Status Information
$PGRMV - 3D Velocity Information
$PGRMZ - Altitude Information
$PSLIB - Tune DPGS Beacon Receiver
[Top]
$HCHDG
Compass Heading
This sentence is used on Garmin eTrex summit, Vista and GPS76S receivers to
output the value of the internal flux-gate compass. Only the magnetic heading
and magnetic variation is shown in the message.
$HCHDG,101.1,,,7.1,W*3C
where:
HCHDG Magnetic heading, deviation, variation
101.1 heading
,, deviation (no data)
7.1,W variation
$PGRMB
DGPS Beacon Information
$PGRMB,1,2,3,4,5,6,7,8,9*HH
1 = Tune frequency, Kilohertz (283.5 - 325.0 in 0.5 steps)
2 = Bit rate, Bits / second (0, 25, 50, 100, 200)
3 = SNR (Signal to Noise Ratio), 0 - 31
4 = Data Quality, 0 - 100
5 = Distance to beacon reference station
6 = Distance unit (K=Kilometres)
7 = Receiver communication status (0=Check wiring, 1=No signal, 2=Tuning,
3=Receiving, 4=Scanning)
8 = Fix source (R=RTCM, W=WAAS, N=Non-DPGS fix)
9 = DGPS Mode (A=Automatic, W=WAAS only, R=RTCM Only, N=None; DGPS disabled)
HH = Checksum
$PGRME
Estimated Position Error
eg. $PGRME,15.0,M,45.0,M,25.0,M*22
15.0,M Estimated horizontal position error (HPE), M=metres
45.0,M Estimated vertical position error (VPE), M=metres
25.0,M Overall spherical equivalent position error, M=metres
$PGRMF
GPS Position Fix Data
$PGRMF,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15*HH
1 = GPS week number
2 = GPS seconds in current week
3 = UTC date, ddmmyy format
4 = UTC time, hhmmss format
5 = GPS leap second count
6 = Latitude, dddmm.mmmm format
7 = Latitude hemisphere, N or S
8 = Longitude, dddmm.mmmm format
9 = Longitude hemisphere, E or W
10 = Mode (M=Manual, A=Automatic)
11 = Fix type (0=No fix, 1=2D fix, 2=3D fix)
12 = Speed over ground, kilometres / hour
13 = Course over ground, degrees true
14 = PDOP (Position dilution of precision), rounded to nearest integer
15 = TDOP (Time dilution of precision), rounded to nearest integer
HH = Checksum
$PGRMM
Map datum
Example 1: $PGRMM,Astrln Geod '66*51
'Astrln Geod 66' = Name of currently active datum
Example 2: $PGRMM,NAD27 Canada*2F
'NAD27 Canada' = Name of currently active datum
$PGRMT
Sensor Status Information
$PGRMT,1,2,3,4,5,6,7,8,9*HH
1 = Garmin product model and software version (eg. GPS 16 VER 2.10)
2 = ROM checksum test (P=Pass, F=Fail)
3 = Receiver failure discrete (P=Pass, F=Fail)
4 = Stored data lost (R=Retained, L=Lost)
5 = Real time clock lost (R=Retained, L=Lost)
6 = Oscillator drift discrete (P=Pass, F=Excessive drift detected)
7 = Data collection discrtete (C=Collecting, Null=Not Collecting)
8 = GPS sensor temperature (Degrees C)
9 = GPS sensor configuration data (R=Retained, L=Lost)
HH = Checksum
$PGRMV
3D Velocity Information
$PGRMV,1,2,3*HH
1 = True east velocity, metres / sec
2 = True north velocity, metres / sec
3 = Upward velocity, metres / sec
HH = Checksum
$PGRMZ
Altitude Information
eg1. $PGRMZ,246,f,3*1B
eg2. $PGRMZ,93,f,3*21
93,f Altitude in feet
3 Position fix dimensions 2 = user altitude
3 = GPS altitude
This sentence shows in feet, regardless of units shown on the display.
eg3. $PGRMZ,201,f,3*18
1 2 3
1 201 Altitude
2 F Units - f-Feet
3 checksum
$PSLIB
Tune DPGS Beacon Receiver
Proprietary Differential Control sentences to control a Starlink differential
beacon receiver, assuming Garmin's DBR is made by Starlink.
eg1. $PSLIB,290.5,100,J*22
eg2. $PSLIB,300.0,200,K*23
These two sentences are normally sent together in each group of sentences from
the GPS.
The three fields are: Frequency, bit Rate, Request Type. The value in the third field may be: J status request, K configuration request, blank = tuning
message.
When the GPS receiver is set to change the DBR frequency or baud rate, the "J"
sentence is replaced (just once) by (for example): $PSLIB,320.0,200*59 to set
the DBR to 320 KHz, 200 baud.
To tune a Garmin GBR 21, GBR 23 or equivalent beacon receiver.
$PSLIB,1,2*HH
1 = Beacon tune frequency, Kilohertz (283.5 - 325.0 in 0.5 steps)
2 = Beacon bit rate, Bits / second (0, 25, 50, 100, 200
HH = Checksum
[ Top ]
8 interpreted Garmin proprietary sentences received by GPS unit
$PGRMC - Sensor Configuration Information
$PGRMCE - Sensor Configuration Information Enquiry
$PGRMC1 - Additional Sensor Configuration Information
$PGRMC1E - Additional Sensor Configuration Information Enquiry
$PGRMI - Sensor Initialization Information
$PGRMIE - Sensor Initialization Information Enquiry
$PGRMO - Output Sentence Enable / Disable
$PSLIB - Tune DPGS Beacon Receiver
A few Garmin GPS receiver units are known to receive these sentences, including
the GPS 16 and GPS 17 modules.
[Top]
$PGRMC
Sensor Configuration Information
Used to configure the GPS sensor's operation. The GPS will also transmit this
sentence upon receiving this same sentence or the $PGRMCE sentence.
$PGRMC,1,2,3,4,5,6,7,8,9,10,11,12,13,14*HH
1 = Fix mode (A=Automatic, 2=2D exclusively; host system must supply altitude,
3=3D exclusively)
2 = Altitude above/below mean sea level, metres
3 = Earth datum index. If the user datum index is specified (96), fields 4 to 8
must contain valid values, otherwise they must be blank.
4 = Semi-major axis, metres, 0.001 metre resolution
5 = Inverse flattening factor, 285 to 310, 10e-9 resolution
6 = Delta X earth centred coordinate, metres, -5000 to 5000, 1 metre resolution
7 = Delta Y earth centred coordinate, metres, -5000 to 5000, 1 metre resolution
8 = Delta Z earth centred coordinate, metres, -5000 to 5000, 1 metre resolution
9 = Differential mode (A=Automatic; output DGPS fixes when available otherwise
non-DGPS, D=Only output differential fixes)
10 = NMEA 0183 baud rate (1=1200, 2=2400, 3=4800, 4=9600, 5=19200, 6=300, 7=600)
11 = Velocity filter (0=None, 1=Automatic, 2-255=Filter time constant; seconds)
12 = PPS mode (1=None, 2=1 Hertz)13 PPS pulse length, N 0 to 48. Length (milliseconds) = (N+1)*20
14 = Dead reckoning valid time, 1 to 30, seconds
HH = Checksum
$PGRMCE
Sensor Configuration Information Enquiry
The unit will respond by transmitting a $PGRMC sentence containing the current
default values.
$PGRMCE*HH
HH = Checksum
$PGRMC1
Additional Sensor Configuration Information
Used to configure additional aspects of the GPS sensor's operation. The GPS will
also transmit this sentence upon receiving this same sentence or the $PGRMC1E
sentence.
$PGRMC1,1,2,3,4,5,6,7,8,9*HH
1 = NMEA 0183 output time, 1-900, seconds (Not applicable to GPS16A)
2 = Binary phase output data (1=Off, 2=On)
3 = Position pinning (1=Off, 2=On)
4 = DGPS beacon frequency, Kilohertz, 283.5 to 325.0 in 0.5 steps
5 = DGPS beacon bit rate (0, 25, 50, 100, 200)
6 = DGPS beacon scanning (1=Off, 2=On)
7 = NMEA 0183 version 3.00 mode indicator (1=Off, 2=On)
8 = DGPS mode (A=Automatic, W=WAAS only, R=RTCM only, N=None; DGPS disabled)
9 = Power save mode (P=Activated, N=Normal)
HH = Checksum
$PGRMC1E
Additional Sensor Configuration Information Enquiry
The unit will respond by transmitting a $PGRMC1 sentence containing the current
default values.
$PGRMC1E*HH
HH = Checksum
$PGRMI
Sensor Initialization Information
Used to set the GPS sensor's set time and position and then commences satellite
acquisition. The GPS will also transmit this sentence upon receiving this same
sentence or the $PGRMIE sentence.
$PGRMI,1,2,3,4,5,6,7*HH
1 = Latitude, dddmm.mmm format
2 = Latitude hemisphere, N or S
3 = Longitude, dddmm.mmm format
4 = Longitude hemisphere, N or S
5 = Current UTC date, ddmmyy format
6 = Current UTC time, hhmmss format
7 = Receiver command (A=Auto locate, R=Unit reset)
HH = Checksum
$PGRMIE
Sensor Initialization Information Enquiry
The unit will respond by transmitting a $PGRMI sentence containing the current
default values.
$PGRMIE*HH
HH = Checksum
$PGRMO
Output Sentence Enable / Disable
$PGRMO,xxxxx,n*HH
xxxxx = Target sentence name (eg. GPGGA, GPGSA)
n = Target mode (0=Disable specified sentence, 1=Enable specified sentence,
2=Disable all output sentences except PSLIB, 3=Enable all output sentences
except GPALM, 4=Restore factory defaults)
HH = Checksum
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Format of latitudes and longitudes
Where a numeric latitude or longitude is given, the two digits immediately to
the left of the decimal point are whole minutes, to the right are decimals of
minutes, and the remaining digits to the left of the whole minutes are whole
degrees.
eg. 4533.35 is 45 degrees and 33.35 minutes. ".35" of a minute is exactly 21
seconds.
eg. 16708.033 is 167 degrees and 8.033 minutes. ".033" of a minute is about 2
seconds.
[ Top ]
References
This information on NMEA sentences has been sourced from all over the 'net and I
make no apologies for any inaccuracies or errors. Still, it's useful stuff. I
wish to thank all the sources, which are listed on my GPS Links page. Please
contact me if you know of freely available interpretations of sentences which
are not on this page.
[Top]
Copyright © Glenn Baddeley 2003
http://home.pacific.net.au/~gnb/gps/nmea.html was last updated 29 Sep 2003.