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GE863-GPS Software User Guide
1vv0300724 Rev. 2 - 24/01/07
5.4.3 GSA - GNSS DOP and Active Satellites
This sentence reports the GPS receiver’s operating mode, satellites used in the navigation solution
reported by the GGA sentence and DOP values.
Table D contains the values for the following example:
$GPGSA,A,3,07,02,26,27,09,04,15, , , , , ,1.8,1.0,1.5*33
Table D: GSA Data Format
Name Example Units Description
Message ID $GPGSA GSA protocol header
Mode 1 A See Table E
Mode 2 3 See Table F
Satellite
Used1.
Satellite used
in solution.1
07 Sv on Channel 1
Satellite
Used1
02 Sv on Channel 2
....
Satellite
Used1
PDOP 1.8
HDOP 1.0
VDOP 1.5
Checksum *33
<CR> <LF> End of message termination
Table E: Mode 1
Value Description
M Manual—forced to operate in 2D or 3D
mode
A 2D Automatic—allowed to automatically
switch 2D/3D
Table F: Mode 2
Value Description
1 Fix not available
2 2D (<4 SVs used)
3 3D (>3 SVs used)
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