Alpine Navigation Radio Owner's Manual download pdf (Page 78)

INA-W910R Navigation Software Owner’s Manual 78

5 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 or you reach your destination. See also: Route.

City Centre

The city/town centre is not the geometric centre of the city/town 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.

Colour theme

Your software comes with different colour themes for daytime or night use of the map and

menu screens. Themes are custom graphic settings and they can have different colours 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. 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 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

The software works with digital maps which are not simply the computerised 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 colours.

In 3D mode, you can see the altitude differences, for example valleys and mountains,

elevated roads, and in selected cities 3D landmarks and 3D buildings are also displayed.

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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Alpine Navigation Radio Owner's Manual Page 78