User`s guide
Chapter 5 - I/O Commands
POSITION LOCK PARAMETERS MESSAGE (@@AM)
Applicability: M12+ Positioning receivers
This message allows the user to modify the default speed and distance thresholds for the
Position Lock function. The position reported by the receiver will be locked if the current speed
and distance traveled are both less than their respective thresholds, and the Position Lock
function has been enabled using the @@AS command.
This function is normally employed by positioning receiver users who are displaying position on a
map display. With Position Lock enabled, the displayed position of the receiver will not drift when
the receiver is stationary (sitting at a traffic light, for example.) Under normal conditions with
Position Lock OFF the displayed position will tend to wander over a 3-5 meter radius due to
errors in the GPS system.
Default values: Speed threshold = 0.5 m/s
Distance threshold = 100 m
Related Command: @@AS Position Lock Control
Legacy Code Compatibility: The @@AM command structure detailed here is identical to that
used on the earlier M12 receiver.
Motorola GPS Products - M12+ User's Guide Revision 6.X 09FEB05
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