User's Manual

A NMEA-0183 Output
178 Trimble R7/R8 GPS Receiver User Guide
TrimbleR7/R8 GPS Receiver Operation
ROT Rate of Turn
The ROT string is shown below, and Table A.14 describes the message
fields.
$GPROT,35.6,A*4E
VTG Actual Track Made Good Over and Speed Over Ground
An example of the VTG message string is shown below. Table A.15
describes the message fields.
$GPVTG,,T,,M,0.00,N,0.00,K*4E
Table A.14 ROT message fields
Field Meaning
1 Rate of turn, degrees/minutes, "–" indicates bow turns to port
2
Invalid data
Table A.15 VTG message fields
Field Meaning
1 Track made good (degrees true)
2
T: track made good is relative to true north
3 Track made good (degrees magnetic)
4
M: track made good is relative to magnetic north
5 Speed, in knots
6
N: speed is measured in knots
7 Speed over ground in kilometers/hour (kph)
8
K: speed over ground is measured in kph