Vector Sensor Reference Manual 83
6.6.7 RRE Data Message
The RRE message contains the satellite range residuals and estimated position error. Table 6-12
breaks down the RRE data message into its components. This message has the following format.
$GPRRE,n,ii,rr…ii,rr,hhh.h,vvv.v *cc<CR><LF>
Table 6-12 RRE Data Message Defined
Field Description
n Number of satellites used in position computation
ii Satellite number
rr Range residual in meters
hhh.h Horizontal position error estimate in meters
vvv.v Vertical position error estimate in meters
*cc Checksum
<CR><LF> Carriage return and line feed
6.6.8 VTG Data Message
The VTG message contains velocity and course information. Table 6-13 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 6-13 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
*cc Checksum
<CR><LF> Carriage return and line feed
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