21
GSA – GNSS DOP and Active Satellites
Receiver operating mode, the values of DOPs, and PRN numbers for satellites used
in the GGA position solution.
$GPGSA,gsa1,gsa2,(gsa3*12),gsa4,gsa5,gsa6*hh<CR><LF>
Parameters
Descriptions
Notes
gsa1
Selection Mode
gsa2
Mode for position fix
1 – fix not available;
2 – 2D;
3 – 3D;
gsa3*12
PRN numbers for satellites used in the
position solution. There will be 12
available fields for PRN numbers. 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.
xx
gsa4
PDOP
0 ~ 99.99 in meters
gsa5
HDOP
0 ~ 99.99 in meters
gsa6
VDOP
0 ~ 99.99 in meters
hh
Checksum
hex number (2 –
character)
<CR><LF> End of message
