OmniSTAR 8200HP User Manual
Issue 1.07, 10/2008
59
NMEA 0183 Message Formats
In this section each message is described in more detail.
GGA – GPS Fix Data
The GGA message includes time, position and fix related data for the GPS
receiver.
$GPGGA,hhmmss.ss,ddmm.mmmmm,D,dddmm.mmmmm,D,Q,sv,H.H,h.hh,
M,h.hh,M,A.AA,DRID*XX
Field Number Description
1 UTC of Position fix
2,3
Latitude in DDMM,MMMM, N (North) or S (South).
1
4,5 Longitude in DDDMM,MMMM format, E(East) or
W (West).
1
6 GPS Quality Indicator: 0=No GPS, 1=GPS,
2=DGPS (VBS), 4=HP/XP (fixed)
2
, 5=HP/XP (float).
2
7 Number of Satellites in Use.
8 Horizontal Dilution of Precision (HDOP).
9,10 Height above Mean Sea level in Meters, M = Meters.
11,12
Geodial Separation in Meters, M = Meters.
3
13
Age of Differential GPS Data.
4
14
Differential Reference Station ID (0000 – 1023)
5
Table 11: Description of the GGA message.
NOTES:
1. The GGA message provides 8 decimal places. In non-differential mode,
only the first four decimals are relevant. In (VBS) differential mode, the first
five decimals are relevant. In HP/XP mode, the first seven decimals are
relevant.
2. Status ‘fixed’ = converged HP/XP solution. Status ‘float’ = unconverged
HP/XP solution.
3. Geodial Separation is the difference between the WGS-84 earth ellipsoid
and mean-sea-level (MSL).
4. Time in seconds since the last OmniSTAR correction update.
5. For OmniSTAR, reference station ID 0100 = VBS, 1000 = HP, 1008 = XP,
1016 = HP+XP (firmware > 3.50 only).
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