User`s guide

Chapter 3 - Receiver Descriptions
If backup power is available, the M12+ retrieves its last known position coordinates from RAM
when main power is reapplied, and uses this information in the satellite acquisition algorithm. In
addition, the receiver retains the almanac and last used satellite ephemeris as long as the backup
power is applied. If you move the receiver a great distance before using it again, it will find and
acquire satellites, but the TTFF may be longer than normal because the receiver will start looking
for the satellites that are actually visible at the last known coordinates. You can initialize the new
approximate position coordinates for faster TTFF if desired.
Each message in the I/O format description in Chapter 5 shows the default value for each
parameter.
Shut Down
It is recommended that the receiver not be shut down within 35s of computing an initial 2D or 3D
position fix. This allows time for a full set of ephemeredes to be downloaded to RAM, which may
shorten the next startup time.
Motorola GPS Products - M12+ User's Guide Revision 6.X 09FEB05
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