User`s guide

Chapter 5 - I/O Commands
DATUM SELECT COMMAND (@@Ao)
Applicability: M12+ and M12+ Timing receivers
The M12+ has one predefined datum (WGS-84) stored in non-volatile memory, and one user
definable datum. Datums are referenced by an ID number. The predefined datum is number 49,
and the user definable datum is number 50.
The user instructs the receiver which datum to use by sending the Datum Select command. The
user can instruct the GPS receiver to use the user definable datum by sending a Datum Select
command with the ID option set to 50.
NOTE: Before Datum 50 may be used, the M12+ must have the user datum
information programmed into it using the @@Ap command. If this is not done,
Datum 50 will contain WGS-84 coordinates, identical to Datum 49.
Default datum: WGS-84 (ID code 49)
Legacy Code Compatibility: The @@Ao command has been implemented in an identical fashion
on virtually all Motorola Oncore receivers. The main difference is that the VP receivers had
sufficient memory to hold 48 of the most commonly used datums, whereas the M12+ can store
one.
Motorola GPS Products - M12+ User's Guide Revision 6.X 09FEB05
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