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1) If the GPS 30/30 SL is not operated for a period of six
(6) months or more, the unit will "search the sky" in
order to collect satellite orbital information. This
process is fully automatic but the host system should
allow the GPS 30/30 SL to remain on for at least 12.5
minutes after the first satellite is acquired to complete
collecting almanac data (see Section 4 for more
information on status indications).
2) If the internal memory backup battery fails while the
host system power is off and not connected to
standby power, the GPS 30/30 SL will search the sky
as described above. The system designer should be
aware of the availability of standby power input to the
GPS 30/30 SL to prevent this situation.
3) If the initial data is significantly inaccurate, the GPS
30/30 SL will perform an operation known as
TM
AutoLocate
. This procedure is fully automatic and,
under normal circumstances, will require 4-10 minutes
to calculate a navigation solution. AutoLocate
unlike search the sky, does not require that the GPS
30/30 SL continue to operate after a fix has been
obtained.
9
TM
,
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