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54 Magellan SporTrak
How often do I need to initialize the SporTrak?
Initializing the SporTrak decreases the time it takes to get a
position fix during cold start. What is meant by a cold start
is that the SporTrak has no reference to use as a guide to tell
it what satellites should be overhead. Without a reference to
start with, the SporTrak will have to “search the sky” trying
to find any satellite that may be in “view.” This takes time
and can increase the time it takes to get its first position fix.
(Can take 10 minutes in severe conditions.)
So where does this reference come from? Under normal
operating conditions, the last position fix computed before
the SporTrak was turned off is stored into memory and will
be used as the reference the next time the SporTrak is turned
on. However, if you cleared the memory (see Clearing
Memory - All in the Reference Chapter) this stored refer-
ence point is removed from memory and you probably will
want to initialize the receiver again. Also, if you travel with
your SporTrak for more than 500 miles with it turned off, it
will still have the reference point but it may be too inaccu-
rate to be useful and again, you may want to initialize the
SporTrak.
Navigation Screens
Why does my compass not point in the right direction?
The SporTrak computes direction by comparing your
present position to the last position taken, it requires that
you be moving to compute your compass heading. Further-
more, to eliminate error, you must be moving at a minimum
of 0.5 mph.
Routes
What is a backtrack route?
A backtrack route allows you to “retrace” your steps. As you
are moving, the SporTrak automatically creates and stores
hidden waypoints into memory. These waypoints are the
ones that the SporTrak will use to retrace your steps. When
you create a backtrack route, the SporTrak converts these
hidden waypoints into User Waypoints.