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5700 GPS Receiver User Guide 139
NMEA-0183 Output 12
Reference
VTG Actual Track Made Good Over and Speed Over Ground
An example of the VTG message string is shown below. Table 12.11
describes the message fields.
$GPVTG,,T,,M,0.00,N,0.00,K*4E
9 Quality indicator:
0: Fix not available or invalid
1: Autonomous GPS fix
2: Differential carrier phase solution RTK(float)
3: Differential carrier phase solution RTK(fix)
4: Differential code-based solution, DGPS
10 Number of satellites used in solution
11 PDOP
Table 12.11 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
Table 12.10 PTNL,VHD message fields (Continued)
Field Meaning