User`s guide

Chapter 5 - I/O Commands
Motorola GPS Products - M12+ User's Guide Revision 6.X 09FEB05
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GPVTG (NMEA TRACK MADE GOOD AND GROUND SPEED)
Applicability: M12+ positioning receivers
This command enables the GPVTG Track Made Good and Ground Speed message and
determines the rate at which the information is transmitted. The periodic rate field (yyyy) instructs
the receiver either to output this message once (polled), or to output this message at the
indicated update rate (continuously).
Once the receiver is set to continuous output, the continuous flow can be stopped by sending a
one-time (polled) output request. The receiver will output the response one final time, and then
terminate any further message outputs. If the receiver is not computing a position fix, all numeric
fields (a.a, c.c, e.e, g.g) will be nulled.
NOTE: The magnetic track field (c.c) will always be nulled since the M12 Oncore does not have
this information.