Supported NMEA0183 sentences
| Messagetype | Description |
|---|---|
| GGA | GPS - Global Positioning System Fix Data |
| GLL | GPS - Geographic Position, Latitude / Longitude |
| RMC | GPS - Recommended minimum specific GPS/Transit data |
| VTG | GPS - Track made good and ground speed |
| ZDA | GPS - Time and Date |
| GSA | GPS - GPS DOP and active satellites |
| GSV | GPS satellites in view |
| GGK | GPS - Trimble: Time, position, position type and DOP |
| DBK | Echosounder - Depth below keel |
| DBS | Echosounder - Depth below surface |
| DBT | Echosounder - Depth below transducer |
| DPT | Echosounder - Depth and transducer offset |
| ODC | Echosounder - ODEC DPT Format |
| HDG | Heading - Heading Deviation and Variation |
| HDM | Heading - Heading Magnetic |
| HDT | Heading - Heading True |
| VDM | AIS - VHF Data Link Message |
Other NMEA0183 Sentences
| Messagetype | Description |
|---|---|
| AAM | Waypoint Arrival Alarm |
| ALM | GPS Almanac Data |
| APA | Autopilot Sentence "A" |
| APB | Autopilot Sentence "B" |
| BEC | Bearing and distance to waypoint - dead reckoning |
| BOD | Bearing - Waypoint to Waypoint |
| BWW | Bearing - Waypoint to Waypoint |
| FSI | Frequency Set Information |
| MSK | MSK DGPS Receiver Information |
| MTW | Water Temperature |
| MWV | Wind Speed and Angle |
| VHW | Water Speed and Heading |
AAM - Waypoint Arrival Alarm
Category: GPS
Example: $GPAAM,A,A,0.50,N,WPT0001*43
| Field# | Example | Description |
|---|---|---|
| 1 | A | Status, arrival circle entered, A = True, V = False |
| 2 | A | Status, perpendicular passes at waypoint, A = True, V = False |
| 3 | 0.5 | Arrival circle radius |
| 4 | N | Units: N = Nautical Miles |
| 5 | WPT0001 | Waypoint Name |
| 6 | 43 | CRC Checksum of NMEA data |
ALM - Almanac Data
Category: GPS
Example: $GPAAM,A,A,0.50,N,WPT0001*43
| Field# | Example | Description |
|---|---|---|
| 1 | A | Status, arrival circle entered, A = True, V = False |
| 2 | A | Status, perpendicular passes at waypoint, A = True, V = False |
| 3 | 0.5 | Arrival circle radius |
| 4 | N | Units: N = Nautical Miles |
| 5 | WPT0001 | Waypoint Name |
| 6 | 43 | CRC Checksum of NMEA data |
APA - Autopilot Sentence "A"
Category: Autopilot
Example: $GPAPA,A,A,0.10,R,N,V,V,011,M,DEST*82
| Field# | Example | Description |
|---|---|---|
| 1 | A | Status, V = GPS signal warning, A = general warning flag |
| 2 | A | Status, V = GPS signal warning, A = general warning flag |
| 3 | 0.10 | Cross track error magnitude |
| 4 | R | Direction to steer (L)eft or (R)ight |
| 5 | N | Cross track units, nautical miles (N) or kilometres (K) |
| 6 | V | Status: A = arrival circle entered |
| 7 | V | Status: A = perpendicular passed at waypoint |
| 8 | 011 | Bearing origin to destination |
| 9 | M | Bearing, (T)rue or (M)agnetic |
| 10 | DEST | Destination waypoint name |
APB - Autopilot Sentence "B"
Category: Autopilot
Example: $GPAPB,A,A,0.10,R,N,V,V,011,M,DEST,011,M,011,M*82
| Field# | Example | Description |
|---|---|---|
| 1 | A | Status, V = GPS signal warning, A = general warning flag |
| 2 | A | Status, V = GPS signal warning, A = general warning flag |
| 3 | 0.10 | Cross track error magnitude |
| 4 | R | Direction to steer (L)eft or (R)ight |
| 5 | N | Cross track units, nautical miles (N) or kilometres (K) |
| 6 | V | Status: A = arrival circle entered |
| 7 | V | Status: A = perpendicular passed at waypoint |
| 8 | 011 | Bearing origin to destination |
| 9 | M | Bearing, (T)rue or (M)agnetic |
| 10 | DEST | Destination waypoint name |
| 11 | 011 | Bearing present position to destination |
| 12 | M | Bearing, (T)rue or (M)agnetic |
| 13 | 011 | Heading to steer to destination waypoint |
| 14 | M | Bearing, (T)rue or (M)agnetic |
BEC - Bearing and distance to waypoint - dead reckoning
Category: Autopilot
Example: $GPBEC,220516,5130.02,N,00046.34,W,213.8,T,218.0,M,0004.6,N,EGLM*11
| Field# | Example | Description |
|---|---|---|
| 1 | 220516 | UTC Time, HHMMSS format |
| 2 | 5130.02 | Latitude of waypoint |
| 3 | N | (N)orth or (S)outh hemisphere |
| 4 | 00046.34 | Longitude of waypoint |
| 5 | W | (E)ast or (W)est from central meridian |
| 6 | 213.8 | True bearing in degrees |
| 7 | T | True bearing indicator |
| 8 | 218.0 | Magnetic bearing in degrees |
| 9 | M | Magnetic bearing indicator |
| 10 | 0004.6 | Distance to waypoint in nautical miles |
| 11 | N | (N)autical miles indicator |
| 12 | EGLM | Waypoint name |
BOD - Waypoint to Waypoint
Category: GPS
Example: $GPBOD,164.3,T,164.5,M,De Volmer,De Volmer*41
| Field# | Example | Description |
|---|---|---|
| 1 | 164.3 | Bearing in degrees |
| 2 | T | T = True Bearing, M = Magnetic Bearing |
| 3 | 164.5 | Bearing in degrees |
| 4 | M | T = True Bearing, M = Magnetic Bearing |
| 5 | De Volmer | TO Waypoint |
| 6 | De Volmer | FROM Waypoint |
| 7 | 41 | CRC Checksum of NMEA data |
BWW - Waypoint to Waypoint
Category: GPS
Example: $GPBWW,164.3,T,164.5,M,De Volmer,De Volmer*41
| Field# | Example | Description |
|---|---|---|
| 1 | 164.3 | Bearing in degrees |
| 2 | T | T = True Bearing, M = Magnetic Bearing |
| 3 | 164.5 | Bearing in degrees |
| 4 | M | T = True Bearing, M = Magnetic Bearing |
| 5 | De Volmer | TO Waypoint |
| 6 | De Volmer | FROM Waypoint |
| 7 | 41 | CRC Checksum of NMEA data |
DBK - Depth Below Keel
Category: Echo Sounder
Example: $SDDBK,1330.5,f,0405.5,M,0221.6,F*2E
| Field# | Example | Description |
|---|---|---|
| 1 | 1330.5 | Depth |
| 2 | f | Units: f = feet |
| 3 | 0405.5 | Depth |
| 4 | M | Units: M = meters |
| 5 | 0221.6 | depth |
| 6 | F | Units: F = Fathoms |
| 7 | 2E | CRC Checksum of NMEA data |
DBS - Depth Below Surface
Category: Echo Sounder
Example: $SDDBS,1330.5,f,0405.5,M,0221.6,F*2E
| Field# | Example | Description |
|---|---|---|
| 1 | 1330.5 | Depth |
| 2 | f | Units: f = feet |
| 3 | 0405.5 | Depth |
| 4 | M | Units: M = meters |
| 5 | 0221.6 | depth |
| 6 | F | Units: F = Fathoms |
| 7 | 2E | CRC Checksum of NMEA data |
DBT - Depth Below Transducer
Category: Echo Sounder
Example: $SDDBT,1330.5,f,0405.5,M,0221.6,F*2E
| Field# | Example | Description |
|---|---|---|
| 1 | 1330.5 | Depth |
| 2 | f | Units: f = feet |
| 3 | 0405.5 | Depth |
| 4 | M | Units: M = meters |
| 5 | 0221.6 | depth |
| 6 | F | Units: F = Fathoms |
| 7 | 2E | CRC Checksum of NMEA data |
DPT - Depth
Category: Echo Sounder
Example: $SDDPT,3.6,0.0*52
| Field# | Example | Description |
|---|---|---|
| 1 | 3.6 | Depth in meters |
| 2 | 0.0 | Offset from transducer: Positive - distance from transducer to water line, or Negative - distance from transducer to keel |
| 3 | 52 | CRC Checksum of NMEA data |
FSI - Frequency Set Information
Category: Communications
Example: $CTFSI,020230,026140,m,5*11
| Field# | Example | Description |
|---|---|---|
| 1 | 020230 | Transmitting frequency (20.230 MHz) |
| 1 | 026140 | Receiving frequency (26.140 MHz) |
| 3 | m | Communications mode |
| 4 | 5 | Power level (Watt) |
GGA - Global Positioning System Fix Data
Category: GPS
Example: $GPGGA,181703.200,5209.6815,N,00643.0724,E,1,08,01,+0025,M,+0047,M,00,0425*6D
| Field# | Example | Description |
|---|---|---|
| 1 | 181703.200 | Current time in U.T.C. |
| 2 | 5209.6815 | Latitude |
| 3 | N | North (N) or South (S) |
| 4 | 00643.0724 | Longitude |
| 5 | E | East (E) or West (W) |
| 6 | 1 | Fix Quality, see table below for values |
| 7 | 08 | Number of satellites used for fix |
| 8 | 01 | HDOP (Horizontal Dilution of Precision) |
| 9 | +0025 | MSL Altitude (Mean Sea Level) |
| 10 | M | Altitude units, Meters (M) or Feet (F) |
| 11 | +0047 | Geoidal separation, the difference between the WGS-84 earth ellipsoid and mean-sea-level |
| 12 | M | Geoidal separation units, Meters (M) or Feet (F) |
| 13 | 00 | Age of differential data (DGPS) |
| 14 | 0425 | DGPS Beacon station ID |
| 15 | 6E | CRC Checksum of NMEA data |
GPS Quality Indicator
| Value | Description |
|---|---|
| 0 | No Fix |
| 1 | GPS fix |
| 2 | DGPS fix (Differential GPS) |
| 3 | PPS fix |
| 4 | RTK fix (Real Time Kinematic) |
| 5 | Float RTK |
| 6 | Dead Reckoning (estimated) |
| 7 | Manual input mode |
| 8 | Simulation mode |
GLL - Geographic Position, Latitude / Longitude
Category: GPS
Example: $GPGLL,5209.6815,N,00643.0724,E,181703.00,A*08
| Field# | Example | Description |
|---|---|---|
| 1 | 5209.6815 | Latitude |
| 2 | N | North (N) or South (S) |
| 4 | 00643.0724 | Longitude |
| 5 | E | East (E) or West (W) |
| 6 | 181703.00 | Current time in U.T.C. |
| 7 | A | Status, data valid (A) or data invalid (V) |
| 8 | 08 | CRC Checksum of NMEA data |
GSA - GPS DOP and active satellites
Category: GPS
Example: $GPGSA,A,3,05,17,22,09,14,04,30,,,,,,1.8,1.2,1.3*32
GSV - GPS satellites in view
Category: GPS
Example:
$GPGSV,3,1,11,09,76,148,32,05,55,242,29,17,33,054,30,14,27,314,24*71
$GPGSV,3,2,11,30,16,246,32,22,14,279,24,24,13,077,,26,09,172,23*7E
$GPGSV,3,3,11,04,07,102,30,29,02,170,09,18,02,243,*42
HDG - Heading - Deviation and Variation
Category: Heading
Example: $HCHDG,98.3,0.0,E,12.6,W*57
| Field# | Example | Description |
|---|---|---|
| 1 | 98.3 | Heading in degrees |
| 2 | 0.0 | Magnetic deviation in degrees |
| 3 | E | Magnetic deviation direction, (E)ast or (W)est |
| 4 | 12.6 | Magnetic variation in degrees |
| 5 | W | Magnetic variation direction, (E)ast or (W)est |
HDM - Heading - Magnetic
Category: Heading
Example: $HCHDM,093.8,M*2B
| Field# | Example | Description |
|---|---|---|
| 1 | 93.8 | Heading in degrees |
| 2 | M | (M)agnetic |
HDT - Heading - True
Category: Heading
Example: $HCHDT,245.1,T
| Field# | Example | Description |
|---|---|---|
| 1 | 93.8 | Heading in degrees |
| 2 | M | (T)rue |
MSK - MSK DGPS Receiver Information
Category: DGPS
Example: $GPMSK,298.5,A,100,A,2*45
| Field# | Example | Description |
|---|---|---|
| 1 | 298.5 | Frequency in kHz |
| 2 | A | Frequency selection: A = Automatic, M = Manual |
| 3 | 100 | MSK bitrate in bps |
| 4 | A | Bitrate selection: A = Automatic, M = Manual |
| 5 | 2 | Duration of output signal |
| 6 | 45 | CRC Checksum of NMEA data |
MTW - Water Temperature
Category: Echo Sounder
Example: $SDMTW,26.8,C*45
| Field# | Example | Description |
|---|---|---|
| 1 | 26.8 | Temperature |
| 2 | C | Units: C = Celsius |
| 6 | 45 | CRC Checksum of NMEA data |
MWV - Wind Speed and Angle
Category: Weather Instruments
Example: $WIMWV,214.8,R,0.1,K,A*28
| Field# | Example | Description |
|---|---|---|
| 1 | 214.8 | Wind Angle |
| 2 | R | Reference: R = Relative, T = True |
| 3 | 0.1 | Wind Speed |
| 4 | K | Units: M = Meter per second, N = Knots, K = Kilometres per hour |
RMC - Recommended minimum specific GPS/Transit data
Category: GPS
Example: $GPRMC,181704,A,5209.6815,N,00643.0724,E,000.1,187.0,310109,,*24
| Field# | Example | Description |
|---|---|---|
| 1 | 181704 | Current time in U.T.C. |
| 2 | A | Status, data valid (A) or data invalid (V) |
| 3 | 5209.6815 | Latitude |
| 4 | N | North (N) or South (S) |
| 5 | 00643.0724 | Longitude |
| 6 | E | East (E) or West (W) |
| 7 | 000.1 | SOG (Speed Over Ground) in knots |
| 8 | 187.0 | COG (Course Over Ground) in degrees |
| 9 | 310109 | Date (DDMMYY) |
| 10 | Magnetic Variation (Not used when RMC is used by GPS) | |
| 11 | 24 | CRC Checksum of NMEA data |
VHW - Water Speed and Heading
Category: Other
Example: $IIVHW,245.1,T,245.1,M,000.01,N,000.01,K
| Field# | Example | Description |
|---|---|---|
| 1 | 245.1 | True heading in degrees |
| 2 | T | (T)rue indicator |
| 3 | 245.1 | Magnetic heading in degrees |
| 4 | M | (M)agnetic indicator |
| 5 | 000.01 | Speed of vessel relative to the water (Knots) |
| 6 | N | N = Knots |
| 7 | 000.01 | Speed of vessel relative to the water (Kmh) |
| 8 | N | K = kilometres per hour |
VTG - Track made good and ground speed
Category: GPS / Compass
Example: $GPVTG,37.38,T,,M,0.08,N,0.1,K*56
| Field# | Example | Description |
|---|---|---|
| 1 | 37.38 | Course in degrees |
| 2 | T | Reference, True (T) or Magnetic (M) |
| 3 | Course (Field is empty, because it is only used by compasses) | |
| 4 | M | Reference, True (T) or Magnetic (M) |
| 5 | 0.08 | Speed |
| 6 | N | Speed units, Knots (N) or Kilometre per hour (K) |
| 7 | 0.1 | Speed |
| 8 | K | Speed units, Knots (N) or Kilometre per hour (K) |
| 9 | 56 | CRC Checksum of NMEA data |