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ProMARK X
The Position (POS) Key
When the POS key is pressed, the ProMARK X checks its almanac.
(ProMARK X is shipped with an almanac.) If satellites are visible to its last
known position (last fix or initial position), the satellite search algorithm
starts. In the satellite search algorithm, ProMARK X searches the sky for
satellites. When enough satellites for a position fix are found and acquired,
a position fix is computed and displayed.
You may key in waypoints, enter routes, change AUX and Setup settings,
even collect data without pressing POS. If you access a function that requires
positioning information, the search algorithm will be started automatically
by that function.
The ProMARK X will update its almanac automatically as it tracks satellites.
(This is called almanac refresh, and is described in Collecting an Almanac.) If
the unit has not been used in 6 months or so, however, its almanac is out of
date; the unit will automatically enter almanac collect to update its almanac
before computing a position fix. This will require between 15 and 30 minutes
to complete.
If the unit is not used for 6 months or more, or if you consistently use the unit
only for short periods of time, use AUX 9 to collect a new almanac before
using the unit.
Obtaining a Position Fix.
Orient the antenna in an upward
position with a clear view of the sky
and press POS. The unit checks its
almanac to determine which satel-
lites are available, based on your
last position fix, and the adjacent
screen is displayed.
If the unit's almanac is more than 6 months old, the unit enters
Almanac Collect to locate a satellite and collect a current
almanac before calculating a position fix.
NOTE
Getting Started
COMPUTING
2-15
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