GPS Software

[last updated: 2022-03-20]
go to: GPS module
go to: hiking tracker
go to: Arduino code
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• Adafruit_GPS:
  • Output format:
    • from Adafruit documentation:
      "Despite appearances, the location data is NOT in decimal degrees.
      It is in degrees and minutes in the following format:
      Latitude: DDMM.MMMM (The first two characters are the degrees.)
      Longitude: DDDMM.MMMM (The first three characters are the degrees.)"
    • Example code to print out location looks like this:
      Serial.print(GPS.longitude, 4); Serial.println(GPS.lon);
      GPS.longitude is printed as the numeric longitude, in DDDMM.MMMM format
      This is 3-digit degrees, 2-digit minutes, decimal point, 4 (or more) digits of fractional minutes.
      GPS.lon is the letter (E or W) identifying the location quadrant

      Similarly for latitude, GPS.latitude format is DDMM.MMMM
      and GPS.lat prints out N or S for quadrant identifier

    • Convert lat & lng to DD.DDDD format:
      • Latitude Arduino code:
        float lat1 = GPS.latitude;
        int lat1_deg = floor(lat1/100);
        float lat1_min = (lat1/100 - lat1_deg) * 100;
        float lat1_minDecDeg = lat1_min / 60;
        float latDeg = lat1_deg + lat1_minDecDeg;
      • Longitude Arduino code:
        float lng1 = GPS.longitude;
        int lng1_deg = floor(lng1/100);
        float lng1_min = (lng1/100 - lng1_deg) * 100;
        float lng1_minDecDeg = lng1_min / 60;
        float lngDeg = lng1_deg + lng1_minDecDeg;

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  • NeoGPS:
    • https://github.com/SlashDevin/NeoGPS

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