Magellan NAV 1000 PLUS User Manual page 105

(PILOD
NOTE: On external power or batteries, the unit will continue its search
until a satellite has been found. After collecting an Almanac, the unit will
continue to take position readings until satellites are unavailable.
When PO is pushed and the unit does not have an almanac, the unit
will automatically start searching the sky for satellites. When a satellite is
found, an almanac will be collected. In this case, the user cannot
manually specify the satellite with which to begin the search.
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