node-nmea
Parser for NMEA sentences.
Available sentences:
- GPRMC - recommended minimum data for gps
- GPGGA - time, position, and fix related data
Example: $GPRMC,161006.425,A,7855.6020,S,13843.8900,E,154.89,84.62,110715,173.1,W,A*30
Where:
| Value | Definition |
|---|---|
| 161006.425 | Time in UTC 16:10:06.425 |
| A | Status A=active or V=Void. |
| 7855.6020,S | Latitude 78°55.6020' N |
| 13843.8900,E | Longitude 138°43.8900' E |
| 154.89 | Speed over the ground in knots |
| 84.62 | Track angle in degrees True |
| 110715 | Date - 11 of July 2015 |
| 173.1,W | Magnetic Variation in degrees (- West Declination, + East Declination) |
| A | FAA Mode A=autonomous, D=differential, E=estimated (dead-reckoning), M=manual input, S=simulated, N=data not valid, P=precise (4.00 and later) |
| *30 | The checksum data, always begins with * |
Example: $GPGGA,120558.916,5058.7457,N,00647.0514,E,2,06,1.7,109.0,M,47.6,M,1.5,0000*71
Where:
| Value | Definition |
|---|---|
| 120558.916 | Time in UTC 12:05:58.916 |
| 5058.7457,N | Latitude 50°58.7457' N |
| 00647.0514,E | Longitude 6°47.0514' E |
| 2 | Gps quality. 0=Invalid, 1=GPS fix (SPS), 2=DGPS fix, 3=PPS fix, 4=Real Time Kinematic, 5=Float RTK, 6=estimated (dead reckoning) (2.3 feature), 7=Manual input mode, 8=Simulation mode |
| 06 | Number of satellites |
| 1.7 | HDOP |
| 109.0,M | Altitude in meters |
| 47.6,M | Geoidal Separation in meters |
| 1.5 | Age Gps data in seconds |
| 0000 | Reference Station Id |
| *71 | The checksum data, always begins with * |
Installation
$ npm install @drivetech/node-nmeaUse
const nmea = require('@drivetech/node-nmea')
const raw = '$GPRMC,161006.425,A,7855.6020,S,13843.8900,E,154.89,84.62,110715,173.1,W,A*30'
const data = nmea.parse(raw)
data.valid // true
data.raw // '$GPRMC,161006.425,A,7855.6020,S,13843.8900,E,154.89,84.62,110715,173.1,W,A*30'
data.type // 'RMC'
data.gps // true
data.datetime // Sat Jul 11 2015 13:10:06 GMT-0300 (CLT)
data.loc // { geojson: { type: 'Point', coordinates: [ 138.7315, -78.9267 ] }, dmm: { latitude: '7855.6020,S', longitude: '13843.8900,E' } }
data.speed // { knots: 154.89, kmh: 286.85627999999997 }
data.track // '84.62'
data.magneticVariation // '173.1,W'
data.mode // 'Autonomous'