A NMEA-0183 Output
136 Trimble R6/R7 GPS and Trimble R8 GNSS Receivers User Guide
Trimble R6 and R7 GPS/R8 GNSS Receiver Operation
VTG Actual Track Made Good Over and Speed Over Ground
An example of the VTG message string is shown below. Tabl e A. 15 describes the
message fields.
$GPVTG,,T,,M,0.00,N,0.00,K*4E
ZDA UTC Day, Month, And Year, and Local Time Zone Offset
An example of the ZDA message string is shown below. Table A.16 describes the
message fields.
$GPZDA,172809,12,07,1996,00,00*45
Fields 5 and 6 together yield the total offset. For example, if field 5 is –5 and field 6 is
+15, local time is 5 hours and 15 minutes earlier than GMT.
Table A.15 VTG message fields
Field Meaning
1 Track made good (degrees true)
2
3 Track made good (degrees magnetic)
4
5 Speed, in knots
6
7 Speed over ground in kilometers/hour (kph)
8
Table A.16 ZDA message fields
Field Meaning
1UTC
2 Day, ranging between 01 and 31
3 Month, ranging between 01 and 12
4Year
5 Local time zone offset from GMT, ranging from 00 to ±13 hours
6 Local time zone offset from GMT, ranging from 00 to 59 minutes
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