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RoyalTek Confidential 16
REB-4315 Operational Manual
Table 9 VTG Data Format
Name Example Units Description
Message ID $GPVTG VTG protocol header
Course over rgound 79.65 degrees Measured heading
Reference T True
Course over ground degrees Measured heading
Reference M Magnetic
Speed over ground 2.69 Knots Measured speed
Units N Knots
Speed over ground 5.0 Km/hr Measured speed
Units K Kilometer per hour
Mode A A-autonomous, D=DGPS, E=DR
Checksum *38
<CR><LF> End of message termination
GLL-Geographic Position – Latitude/Longitude
Table 10 contains the values of the following example:
$GPGLL,2503.6319,N,12136.0099,E,053740.000,A,A*52
Table 10 GLL Data Format
Name Example Units Description
Message ID $GPGLL GLL protocol header
Latitude 2503.6319 ddmm.mmmm
N/S indicator N N=north or S=south
Longitude 12136.0099 Dddmm.mmmm
E/W indicator E E=east or W=west
UTC Time 053740.000 hhmmss.sss
Status A A=data valid or V=data not valid
Mode A A=autonomous, D=DGPS, E=DR
Checksum *52
<CR><LF> End of message termination