ZyCast
SG-289 User’s Manual v1.1
16
$GPGGA
This message transfers global positioning system fix data. Following is an example.
$GPGGA,161229.487,3723.2475,N,12158.3416,W,1,07,1.0,9.0,M, , , ,0000*18
The $GPGGA message structure is shown below:
Field Example
Unit
Notes
Message ID
$GPGGA
GGA protocol header.
UTC Time
161229.487
hhmmss.sss
Latitude 3723.2475
ddmm.mmmm
N/S Indicator
N
N=north or S=south.
Longitude 12158.3416
dddmm.mmmm
E/W indicator
W
E=east or W=west.
Position Fix Indictor
1
0: Fix not available or invalid.
1: GPS SPS mode, fix valid.
2: Differ. GPS, SPS mode, fix valid
3-5: Not supported.
6:
Dead Reckoning Mode, fix valid.
(1)
Satellites Used
07
Number of satellites used to calculate fix.
Range 0 to 12.
HDOP 1.0
Horizontal
Dilution of Precision.
MSL Altitude
(2)
9.0
Meter
Altitude above mean seal level.
Units
M
Meter
M stands for “meters”.
Geoid Separation
(2)
Meter
Separation from Geoids can be blank.
Units
Meter
M stands for “meters”.
Age of Diff. Corr.
Second
Age in seconds. Blank (Null) fields when
DGPS is not used.
Diff Ref. Station ID
0000
Checksum *18
<CR> <LF>
Message terminator.
(1)
Only apply to NMEA version 2.3 (and later) in this NMEA message description.
(2) SiRF does not support geoid corrections. Values are WGS84 ellipsoid heights.
