This is one of the sentences always supported by GPS / GNSS receivers.
The RMC sentence contains the time, date, position, course and speed data provided by the GPS / GNSS receiver.
NMEA 4.10 onwards:
1 2 3 4 5 6 7 8 9 10 11 12 13 14
| | | | | | | | | | | | | |
$--RMC,hhmmss.ss,A,ddmm.mm,a,dddmm.mm,a,x.x,x.x,xxxx,x.x,a,m,s*hh<CR><LF>
NMEA 2.3 onwards, prior to NMEA 4.10:
1 2 3 4 5 6 7 8 9 10 11 12 13
| | | | | | | | | | | | |
$--RMC,hhmmss.ss,A,ddmm.mm,a,dddmm.mm,a,x.x,x.x,xxxx,x.x,a,m*hh<CR><LF>
Prior to NMEA 2.3:
1 2 3 4 5 6 7 8 9 10 11 12
| | | | | | | | | | | |
$--RMC,hhmmss.ss,A,ddmm.mm,a,dddmm.mm,a,x.x,x.x,xxxx,x.x,a*hh<CR><LF>
| # | Field | Format | Example | Description |
|---|---|---|---|---|
| 0 | Sentence ID | string | $GPRMC | Talker ID (GP) + message ID (RMC) |
| 1 | Time | hhmmss.sss | 092751.000 | UTC time, typically 2 or 3 dp. Leading zeros are always included |
| 2 | Status | character | A | Data status; A = active (data valid), V = void (receiver warning) |
| 3 | Latitude | ddmm.mmmm | 5321.6802 | Latitude, typically 4 or 5 dp. Leading zeros are always included |
| 4 | NS | character | N | Hemispherical orientation N or S (north or south) |
| 5 | Longitude | dddmm.mmmm | 00630.3371 | Longitude, typically 4 or 5 dp. Leading zeros are always included |
| 6 | EW | character | W | Hemispherical orientation E or W (east or west) |
| 7 | SOG | numeric | 0.146 | Speed over ground in knots, typically 2 or 3 dp |
| 8 | COG | numeric | 77.52 | Course over ground in degrees true, typically 2 dp |
| 9 | Date | ddmmyy | 100117 | Date, ddmmyy |
| 10 | Mag Var | numeric | - | Magnetic Variation in degrees. Null (empty) if unavailable. |
| 11 | Mag Var E/W | character | - | Magnetic Variation, E or W (East or West). Null (empty) if unavailable. |
| 12 | Pos Mode | character | A | Positioning mode indicator (NMEA 2.3 and later) |
| 13 | Nav Status | character | V | Navigational status indicator (NMEA 4.10 and later) |
| 14 | Checksum | hexadecimal | *7B | Checksum |
Notes:
$GNRMC,001031.00,A,4404.13993,N,12118.86023,W,0.146,,100117,,,A*7B
$GPRMC,092750.000,A,5321.6802,N,00630.3372,W,0.02,31.66,280511,,,A*43
$GPRMC,125900.000,A,5637.8345,N,01638.4927,W,0.04,270.04,101222,,,A*7F