[−][src]Module adafruit_gps::nmea

NMEA is the sentence format for receiving data from a GPS.

GPS outputs

GPS sentence outputs.

  • GGA -> TC, Latitude, longitude, Position fix (GPS, DGPS, No fix), sats used, HDOP, altitude, Geoidal Seperation, Age of diff corr
  • VTG -> Course (true), Course (magnetic), speed knots, speed kph, mode.
  • GSA -> Manual or Automatic mode, 2D or 3D fix, List of satellites used, PDOP, HDOP, VDOP.
  • GSV -> Satellites in view data: sat id, elevation, azimuth and SNR for each sat seen.

These two are pointless.

  • RMC -> UTC, lat, long, speed, course, date, magnetic variation.
  • GLL -> Lat, Long. Pretty pointless sentence.

On each iteration, all the data is the same. So why not output all the data and gather it all?

Sentence prefix: ${GP, GL, GA, GN}{GGA, GSA, GSV, RMC, VTG}

GP is short for GPS (American)

GL is short for GLONASS (Russian)

GA is short for Galileo (EU)

GN is multi-system.

Prefixes table ({} means heading of GP/GL/GA is added.

GGAGSAGSVRMCVTG
GPSGPGGAGPGSAGPGSVGPRMCGPVTG
GP+GLGNGGA{}GAS{}GSVGNRMCGNVTG
GP+GL+GAGNGG{}GSA{}GSVGNRMCGNVTG

In the GP+GL and GP+GL+GA modes, all satellites from those systems are used for the best fix.

Modules

gga

Parse GGA sentences

gsa

Parse GSA sentences.

gsv

Parse GSV sentence

nmea

Main moduel for parsing any NMEA sentence and exporting NMEA parsing to lib.rs

rmc

Parse RMC sentences.

vtg

Parse VTG sentences