Glossary - Rosen Multimedia Navigation System Owner's Manual

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Track logs, the sequence of the positions given by the GPS receiver, can be saved
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Save track log
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together with trip logs. They can later be displayed on the map. You can let the
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application save the track log whenever it saves a trip.

6 Glossary

20/]1) GPS .oeccptioJl
The GPS receiver uses satellite signals to calculate its (your) position and needs at least four signals to
give a three-dimensional position, including elevation. Because the satellites are moving and because
objects can block the signals, your GPS device might not receive four signals. If three satellites are
available, the receiver can calculate the horizontal GPS position but the accuracy is lower and the GPS
device does not give you elevation data only 2D reception is possible.
Active route
The currently navigated route. Whenever the destination is set, the route is active until you delete it, reach
your destinatIon or you quit the software. See also: Route.
City Center
The city/tawn center is not the geometric center of the city but an arbitrary point the map creators have
chosen. In towns and villages, it is usually the most important intersection; in larger cities, it is one of the
important intersections.
Color theme
Your software comes with different color themes for daytime or night use of ttle map and menu screens.
Themes are custom graphic settings and they can have different colors for streets, blocks or surface
waters in 20 and 3D modes, and they display shades or shadows in different ways in 3D mode.
One daytime scheme and one night scheme is always selected for the map and for the menus. The
software uses them when it switches from day to night and back.
GPS accuracy
Several factors have impact on the deviation between your real position and tile one given by tile GPS
device. For example, signal delay in the ionosphere or reflecting objects near the GPS device have a
different and varying impact on how accurately the GPS device can calculate your position.
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