Contents
Gate Size 1-8 OFF / ON 0 - 64 5. PRF Fine Tuning 2. Stagger Trigger 3. Antenna Rotation Speed 1. LP2 (.NKE-2044 only) 4. Adaptation 6. Tune Peak Adjustment 7. Tune Indicator Level 6. I/F Device 1. Heading Equipment 2. Manual Heading 3. Jrc All AIS Antenna BNWAS Bridge CCTV Compass Conning Doppler current meter ECDIS Echo sounder EPIRB Fish finder FleetBroadband Global Xpress GPS/DGPS Inmarsat C MF/HF Multi Info Display Navtex NeCST PA Pilot Plotter Radar Remote support Repeater Satellite log Sonar Sound reception Speed log Telephone system UHF VDR/S-VDR VHF VSAT Weatherfax.
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19 Interpreted sentences
There is a full list of $GPxxx sentence codes available, without links to format details.
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$GPBOD
Bearing Origin to Destination
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.
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.)
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
$GPGGA
Global Positioning System Fix Data
Name | Example Data | Description |
---|---|---|
Sentence Identifier | $GPGGA | Global Positioning System Fix Data |
Time | 170834 | 17:08:34 Z |
Latitude | 4124.8963, N | 41d 24.8963' N or 41d 24' 54' N |
Longitude | 08151.6838, W | 81d 51.6838' W or 81d 51' 41' W |
Fix Quality: - 0 = Invalid - 1 = GPS fix - 2 = DGPS fix | 1 | Data is from a GPS fix |
Number of Satellites | 05 | 5 Satellites are in view |
Horizontal Dilution of Precision (HDOP) | 1.5 | Relative accuracy of horizontal position |
Altitude | 280.2, M | 280.2 meters above mean sea level |
Height of geoid above WGS84 ellipsoid | -34.0, M | -34.0 meters |
Time since last DGPS update | blank | No last update |
DGPS reference station id | blank | No station id |
Checksum | *75 | Used 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. $--GGA,hhmmss.ss,llll.ll,a,yyyyy.yy,a,x,xx,x.x,x.x,M,x.x,M,x.x,xxxx
hhmmss.ss = UTC of position
llll.ll = latitude of position
a = N or S
yyyyy.yy = Longitude of position
a = E or W
x = GPS Quality indicator (0=no fix, 1=GPS fix, 2=Dif. GPS fix)
xx = number of satellites in use
x.x = horizontal dilution of precision
x.x = Antenna altitude above mean-sea-level
M = units of antenna altitude, meters
x.x = Geoidal separation
M = units of geoidal separation, meters
x.x = Age of Differential GPS data (seconds)
xxxx = Differential reference station ID
llll.ll = latitude of position
a = N or S
yyyyy.yy = Longitude of position
a = E or W
x = GPS Quality indicator (0=no fix, 1=GPS fix, 2=Dif. GPS fix)
xx = number of satellites in use
x.x = horizontal dilution of precision
x.x = Antenna altitude above mean-sea-level
M = units of antenna altitude, meters
x.x = Geoidal separation
M = units of geoidal separation, meters
x.x = Age of Differential GPS data (seconds)
xxxx = Differential reference station ID
$GPGLL
Geographic Position, Latitude / Longitude and time.
$--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
yyyyy.yy = Longitude of position
a = E or W
hhmmss.ss = UTC of position
A = status: A = valid data
$GPGSA
GPS DOP and active satellites
$GPGSV
GPS Satellites in view
$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
x.x = Heading, degrees True
$GPR00
List of waypoint IDs in currently active route
$GPRMA
Recommended minimum specific Loran-C data
$GPRMB
Recommended minimum navigation information (sent by nav. receiver when a destination waypoint is active)
$GPRMC
Recommended minimum specific GPS/Transit data
$GPRTE
Routes
- 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
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
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
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.
The actual track made good and speed relative to the ground.
$--VTG,x.x,T,x.x,M,x.x,N,x.x,K
x.x,T = Track, degrees True
x.x,M = Track, degrees Magnetic
x.x,N = Speed, knots
x.x,K = Speed, Km/hr
x.x,T = Track, degrees True
x.x,M = Track, degrees Magnetic
x.x,N = Speed, knots
x.x,K = Speed, Km/hr
$GPWPL
Waypoint location
$GPXTE
Cross Track Error, Measured
$GPZDA
Date & Time
UTC, day, month, year, and local time zone.
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6 Garmin proprietary sentences with 4 interpreted
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$PGRME
Estimated Position Error
$PGRMM
Map datum
$PGRMZ
Speed Log Transducer
Altitude Information
$PSLIB
Proprietry Garman (Differential Control)
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All $GPxxx sentence codes and short descriptions
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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.
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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.
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Copyright © Glenn Baddeley 2001http://aprs.gids.nl/gps was last updated 20 Jule 2001.