CSI Wireless GBX, Reference Manual

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GBX Reference Manual 57
Table 4-7 SAT Data Message Defined
Field Description
d1 Number of SVs locked
d2 SV PRN number
d3 SV azimuth angle in degrees
d4 SV elevation angle in degrees
f1 SV signal/noise ratio in dB Hz
c SV used in position computation U = used, - = not used
*cc Checksum
<CR><LF> Carriage return and line feed
4.8.7 VTG Data Message
The VTG message contains velocity and course information. Table 4-8
breaks down the VTG data message into its components. This
message has the following format:
$GPVTG,ttt,c,ttt,c,ggg.gg,u,ggg,gg,u*cc<CR><LF>
Table 4-8 VTG Data Message Defined
Field Description
ttt True course over ground, ttt = 000 to 359, in degrees
c True course over ground indicator, c = T always
ttt Magnetic course over ground, ttt = 000 to 359, in degrees (output with
magnetic model option only)
c Magnetic course over ground Indicator, always c = M
ggg.gg Speed over ground, 000 to 999 knots
u Speed over ground units, u = N = Nautical mile/h
ggg.gg Speed over ground, 000 to 999 km/h
u Speed over ground units, u = K = kilometer/h