NorthStar MX500, Operator'S & Installation Manual

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Version 3.0
117
Configuration Operator’s Manual
Init Pos - Initial Position Entry
This screen is provided to help the GPS receiver in the MX antenna to
get a faster first position fix. While the smart antenna is capable of
computing its position without any user input, this feature can cause
a position fix to occur several minutes earlier. Another time this feature
is useful is when the receiver has been moved over 300 miles from the
last location it was used while in the off condition. Again, the receiver
will calculate a position fix without any user input in this circumstance.
However, moving the receiver to a new location and not inputting a
new initial position will cause the receiver to select a satellite constel-
lation consistent with the last known receiver coordinates. In this event
the receiver may “get lucky” and find common satellites between the
old position and the new location, or it may take up to 20 minutes to go
through all of the constellation possibilities. Note that the receiver will
stay on the original constellation for 15 minutes before attempting
other constellation possibilities. We assume the receiver will be turned
on and off in the same general area each time, and we provide the unit
every opportunity to try and track satellites at the last known coordi-
nates.