Glossary - Jensen VM9725BT Operating Instructions Manual

VM9725BT

GLOSSARY

2D/3D GPS reception
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 iGo primo. See also: Route.
City Center
The city/town 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
iGo primo comes with different color themes for daytime or night use of the
map and menu screens. Themes are custom graphic settings and they can have
different colors for streets, blocks or surface waters in 2D 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. iGo primo 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
the one given by the 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.
Map
iGo primo works with digital maps which are not simply the computerized
versions of traditional paper maps. Similarly to the paper road maps, the 2D mode
of digital maps show you streets, roads, and elevation is also shown by colors.
You can use digital maps interactively: you can zoom in and out (increase or
decrease the scale), you can tilt them up and down, and rotate them left and right.
In GPS-supported navigation, digital maps facilitate route planning.
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