Frequently Asked Questions - Magellan GPS 315 User Manual

Frequently Asked Questions

General
What is the difference between degrees/minutes/seconds (DEG/
MIN/SEC) and degrees/minutes/minutes (DEG/MIN/MMM or
DEG/MIN/MM)?
What is 2D vs. 3D?
How long can I expect my SporTrak to run on a fresh set of
batteries?
Magellan SporTrak
There are different ways in expressing the coordinates
computed using Lat/Lon coordinate system. With
DEG/MIN/SEC the final set of numbers (SEC) is
expressed as 0-59 while DEG/MIN/MM expresses the
same value as 0-99 and DEG/MIN/MMM is from 0-
999. It would be the same as if you had one clock that
expressed time as hour/minutes/seconds and another
clock that expressed the same time as hours/minutes/
decimals. The accuracy for any of the three is the same.
Which you choose is dependent upon your preference
or any chart you are using at the same time. (You
should always make sure that your SporTrak is setup to
be the same as any map or chart you may be using.)
The difference is primarily how many satellites are used
to compute the position fix and how elevation is
computed. In 2D (two-dimensional) only three
satellites are needed for a position fix and elevation is
not computed. Any elevation displayed by the
SporTrak during 2D operation is the elevation you
entered. In 3D (three-dimensional), a minimum of four
satellites are needed to compute the position and at the
same time, elevation is computed by the SporTrak.
Under normal operating conditions you should get up
to 15 hours of use while the display backlight is turned
off. This duration will drop significantly if you use the
display backlight.
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