DR + GPS
STARTER KIT REFERENCE MANUAL
Lassen DR + GPS Reference Manual 40
NMEA 0183 MESSAGE FORMATS

GGA-GPS Fix Data

The GGA message includes time, position and fix related data for the GPS
receiver.
$GPGGA,hhmmss.ss,llll.lll,a,nnnnn.nnn,b,t,uu,
v.v,w.w,M,x.x,M,y.y,zzzz*hh <CR><LF>

Table 5: GGA Message

Field # Description
1 UTC of Position
2, 3 Latitude, N (North) or S (South)
4, 5 Longitude, E (East) or W (West)
6 GPS Quality Indicator: 0 = No GPS, 1 = GPS, 2 = DGPS
7 Number of Satellites in Use
8 Horizontal Dilution of Precision (HDOP)
9, 10 Antenna Altitude in Meters, M = Meters
11, 12 Geoidal Separation in Meters, M=Meters. Geoidal separation is the
difference between the WGS-84 earth ellipsoid and mean-sea-level.
13 Age of Differential GPS Data. Time in seconds since the last Type 1 or
9 Update
14 Differential Reference Station ID (0000 to 1023)
hh Checksum

GSA - GPS DOP and Active Satellites

The GSA messages indicates the GPS receiver's operating mode and lists the
satellites used for navigation and the DOP values of the position solution.
$GPGSA,a,x,xx,xx,xx,xx,xx,xx,xx,xx,xx,xx,xx,
xx,x.x,x.x,x.x*hh<CR><LF>