code: function(str, rmc) {
  
        if (rmc.length !== 13 && rmc.length !== 14 && rmc.length !== 15) {
          throw new Error('Invalid RMC length: ' + str);
        }
  
        /*
         $GPRMC,hhmmss.ss,A,llll.ll,a,yyyyy.yy,a,x.x,x.x,ddmmyy,x.x,a*hh
         
         RMC  = Recommended Minimum Specific GPS/TRANSIT Data
         1    = UTC of position fix
         2    = Data status (A-ok, V-invalid)
         3    = Latitude of fix
         4    = N or S
         5    = Longitude of fix
         6    = E or W
         7    = Speed over ground in knots
         8    = Track made good in degrees True
         9    = UT date
         10   = Magnetic variation degrees (Easterly var. subtracts from true course)
         11   = E or W
         (12) = NMEA 2.3 introduced FAA mode indicator (A=Autonomous, D=Differential, E=Estimated, N=Data not valid)
         (13) = NMEA 4.10 introduced nav status
         12   = Checksum
         */
  
        return {
          'time': parseTime(rmc[1], rmc[9]),
          'status': parseRMC_GLLStatus(rmc[2]),
          'lat': parseCoord(rmc[3], rmc[4]),
          'lon': parseCoord(rmc[5], rmc[6]),
          'speed': parseKnots(rmc[7]),
          'track': parseNumber(rmc[8]), // heading
          'variation': parseRMCVariation(rmc[10], rmc[11]),
          'faa': rmc.length > 13 ? parseFAA(rmc[12]) : null,
          'navStatus': rmc.length > 14 ? rmc[13] : null
        };
      }
docs: Recommended Minimum data for gps