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GRS – GNSS Range Residual
This message is used to monitor and support RAIM.
$GPGRS,grs1,grs2,(grs3*12)*hh<CR><LF>
Parameters Descriptions Notes
grs1 UTC time from the GGA hhmmss.ss: hh – hour;
mm – minute; ss.ss –
second
grs2 Mode to indicate the way to calculate
the range residuals.
0 – calculate the range residuals while
the GGA position is estimated;
1 – recalculate the range residuals after
the GGA position is estimated.
Always in Mode 1
grs3*12 Range residuals for satellites used in
position calculation. There will be 12
available fields for residuals. If number
of satellites is less than 12, the
remaining fields will be left as empty
fields. If number of satellites is greater
than 12, only the values of the first 12
satellites will be output.
-999.9 ~ 999.9
hh Checksum hex number (2 – character)
<CR><LF> End of message