User`s guide

Chapter 5 - I/O Commands
Motorola GPS Products - M12+ User's Guide Revision 6.X 09FEB05
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GPGLL (NMEA GEOGRAPHIC LATITUDE AND LONGITUDE)
This command enables the GPGLL Geographic Position-Latitude/Longitude 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. The value of the periodic rate is retained through a power
cycle only if battery backup power is applied.
If the receiver has just powered up and has yet to compute a position fix (GPS status field is 'V'),
then the time field (hhmmss.ss) will be nulled. If the receiver is not computing a position fix
sometime after the first fix the time field (hhmmss.ss) will be frozen.
Legacy Code Compatibility: The GPGLL message was output in a similar fashion by Motorola
VP, GT+, and M12 Oncore receivers.
Note: United States export laws prohibit commercial GPS receivers from outputting valid data if
the calculated GPS height is greater than 18,000 meters (11 miles) and the calculated 3D
velocity is greater than 514 meters/second (1135 miles/hour). If the receiver is used
above both of these limits concurrently, the height and velocity outputs are clamped to
the maximum values. In addition, the latitude and longitude information will be incorrect.