2012/7/30
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GSA - GNSS DOP and Active Satellites
Table B-5 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 B-5 GSA Data Format
Name
Example
Units
Description
Message ID
$GPGSA
GSA protocol header
Mode 1
A
See Table B-6
Mode 2
3
See Table B-7
Satellite Used
1
07
Sv on Channel 1
Satellite Used
1
02
Sv on Channel 2
…..
Satellite Used
1
Sv on Channel 12
PDOP
2
1.8
Position dilution of Precision
HDOP
2
1.0
Horizontal dilution of Precision
VDOP
2
1.5
Vertical dilution of Precision
Checksum
*33
<CR><LF>
End of message termination
1. Satellite used in solution.
2. Maximum DOP value reported is 50. When 50 is reported, the actual DOP may be much larger.
Table B-6 Mode1
Value
Description
M
Manual-forced to operate in 2D or 3D mode
A
2Dautomatic-allowed to automatically switch 2D/3D
Table B-7 Mode 2
Value
Description
1
Fix Not Available
2
2D (<4 SVs used)
3
3D (>3 SVs used)
