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Table 5-5 GSA Data Format
Name Example Units Description
Message ID $GPGSA
GSA protocol header
Mode 1 A See Table 5-6
Mode 2 3
See Table 5-7
Satellite Used(1) 07 Sv on Channel 1
Satellite Used (1) 02 Sv on Channel 2
…… ….
Satellite Used Sv on Channel 20
PDOP 1.8 Position Dilution of Precision
HDOP 1.0 Horizontal Dilution of Precision
VDOP 1.5 Vertical Dilution of Precision
Checksum *33
<CR> <LF> End of message termination
1. Satellite used in solution.
Table 5-6 Mode 1
Value Description
M Manual—forced to operate in 2D or 3D mode
A 2DAutomatic—allowed to automatically switch 2D/3D
Table 5-7 Mode 2
Value Description
1 Fix Not Available
2 2D
3 3D
5.1.4 GNSS Satellites in View (GSV)
Table 5-8 contains the values for the following example:
$GPGSV,2,1,07,07,79,048,42,02,51,062,43,26,36,256,42,27,27,138,42*71
$GPGSV,2,2,07,09,23,313,42,04,19,159,41,15,12,041,42*41
Table 5-8 GSV Data Format
Name Example Units Description
Message ID $GPGSV GSV protocol header
Number of Messages 2 Range 1 to 3
Message Number 1 Range 1 to 3
Satellites in View 07 Range 1 to 12
Satellite ID 07 Channel 1 (Range 1 to 32)
Elevation 79 degrees Channel 1 (Maximum 90)
Azimuth 048 degrees Channel 1 (True, Range 0 to 359)
SNR (C/No) 42 dBHz Range 0 to 99, null when not tracking
.... ....
Satellite ID 27 Channel 4 (Range 1 to 32)
Elevation 27 degrees Channel 4 (Maximum 90)
Azimuth 138 degrees Channel 4 (True, Range 0 to 359)
SNR (C/No) 42 dBHz Range 0 to 99, null when not tracking
Checksum *71
<CR> <LF> End of message termination