Glossary - Isuzu GPS Navigation User Manual

7 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 Isuzu navigation. 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
Isuzu navigation 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.Isuzu navigation 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
Isuzu navigation 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.
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