Altina GPS 9540 사용자 설명서
Table 5-9 RMC Data Format
Name Example
Units
Description
Message ID
$GPRMC
RMC protocol header
UTC Time
161229.487
hhmmss.sss
Status
A
A=data valid or V=data not valid
Latitude 3723.2475
ddmm.mmmm
N/S Indicator
N
N=north or S=south
Longitude 12158.3416
dddmm.mmmm
E/W Indicator
W
E=east or W=west
Speed Over
Ground
0.13 knots
Course Over
Ground
309.62 degrees True
Date 120598
ddmmyy
Magnetic
Variation(1)
degrees E=east or W=west
Checksum *10
<CR> <LF>
End of message termination
NOTE: SiRF Technology Inc. does not support magnetic declination. All “course over ground” data are
geodetic WGS84 directions.
5.7. Course Over Ground and Ground Speed (VTG)
Table 5-10 contains the values for the following example.
$GPVTG,309.62,T, ,M,0.13,N,0.2,K*6E
Table 5-10 VTG Data Format
12
Name Example
Units
Description
Message ID
$GPVTG
VTG protocol header
Course 309.62
degrees Measured
heading
Reference T
True
Course
degrees Measured
heading
Reference M
Magnetic(1)
Speed
0.13
knots
Measured horizontal speed
Units N
Knots
Speed
0.2
km/hr Measured horizontal speed