Audiovox VOM-78 User Manual download pdf (Page 178)

Subject to technical changes

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 pos-

sible.

Active route

The currently navigated route. Whenever the destination is set, the route is active until you delete it, reach your destina-

tion or you quit the software. See also: Route.

City Centre

The city/town centre is not the geometric centre of the settlement 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 ex-

ample, signal delay in the ionosphere or reecting 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.

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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Audiovox VOM-78 User Manual Page 178