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GSA—GNSS DOP and Active Satellites
Table-4
contains the values for the following example
：
$GPGSA,A,3,29,21,26,15,18,09,06,10,,,,,2.32,0.95,2.11*00
GSA Data Format
Table-4
Name
Example
Units
Description
Message ID
$GPGSA
GSA protocol header
Mode 1
A
See
Table-5
Mode 2
3
See
Table-6
Satellite Used
29
SV on Channel 1
Satellite Used
21
SV on Channel 2
....
….
….
....
Satellite Used
SV on Channel 12
PDOP
2.32
Position Dilution of Precision
HDOP
0.95
Horizontal Dilution of Precision
VDOP
2.11
Vertical Dilution of Precision
Checksum
*00
<CR> <LF>
End of message termination
Mode 1
Table-5
Value
Description
M
Manual—forced to operate in 2D or 3D mode
A
2D Automatic—allowed to automatically switch 2D/3D
Mode 2
Table-6
Value
Description
1
Fix not available
2
2D (
＜
4 SVs used)
3
3D (
≧
4 SVs used)
