Magellan NAV 5000, User Manual

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OBSTRUCTIONS BLOCK THE SIGNALS
For ease and comfort of operation, a holder is available for the unit,
which can be mounted to the boat.
COLLECTING AN ALMANAC
The Almanac is a schedule of satellite availability stored in the NAV
5000's memory. This means that before you obtain a position fix, the
unit already knows which satellites are scheduled to be in view (given
your last position or initialized position) and where in the sky to look for
them.
Almanac information is maintained by all satellites, and is updated as
required by GPS system operators to reflect current conditions. Alma-
nac information can be collected from any satellite. The NAV 5000
refreshes its Almanac each time POS, NAV, or VEL is pressed.
Therefore, when the unit is in frequent use, it maintains a current
Almanac.
When the unit has not been used recently (generally, nine months or
more), its Almanac may be out of date. The unit can still obtain a