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NMEA Strings

http://www.gpsinformation.org/dale/nmea.htm#AAM

AAM - Waypoint Arrival Alarm ALM - Almanac data APA - Auto Pilot A sentence APB - Auto Pilot B sentence BOD - Bearing Origin to Destination BWC - Bearing using Great Circle route

  DTM - Datum being used.
  GGA - Fix information
  GLL - Lat/Lon data
  GRS - GPS Range Residuals
  GSA - Overall Satellite data
  GST - GPS Pseudorange Noise Statistics
  GSV - Detailed Satellite data
  MSK - send control for a beacon receiver
  MSS - Beacon receiver status information.
  RMA - recommended Loran data
  RMB - recommended navigation data for gps
  RMC - recommended minimum data for gps
  RTE - route message
  TRF - Transit Fix Data
  STN - Multiple Data ID
  VBW - dual Ground / Water Spped
  VTG - Vector track an Speed over the Ground
  WCV - Waypoint closure velocity (Velocity Made Good)
  WPL - Waypoint Location information
  XTC - cross track error
  XTE - measured cross track error
  ZTG - Zulu (UTC) time and time to go (to destination)
  ZDA - Date and Time

GGA - essential fix data which provide 3D location and accuracy data

$GPGGA,123519,4807.038,N,01131.000,E,1,08,0.9,545.4,M,46.9,M,,*47

GGA	Global Positioning System Fix Data
123519	Fix taken at 12:35:19 UTC
4807.038,N	Latitude 48 deg 07.038' N
01131.000,E	Longitude 11 deg 31.000' E
1	Fix 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
08	Number of satellites being tracked
0.9	Horizontal dilution of position
545.4,M	Altitude, Meters, above mean sea level
46.9,M	Height of geoid (mean sea level) above WGS84 ellipsoid
(empty field)	time in seconds since last DGPS update
(empty field)	DGPS station ID number
*47	the checksum data, always begins with *

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NMEA Strings

GGA - essential fix data which provide 3D location and accuracy data

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