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5 Glossary
2D/3D GPS reception
The GPS receiver uses satellite signals to calculate its (your) position and need 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 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 instructions used in the ongoing navigation. You can save and load routes in Clarion EZ Drive,
but only one route can be active at any given time, and it is always active until you delete it, reach
your destination or you exit Clarion EZ Drive.
City Center
The City 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 an
important intersection.
GPS accuracy
Several factors have an 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.
Route
A series of destinations to be reached one after the other. A simple route contains one start point and
only one destination. Multi-point routes can contain one or more via points (intermediate destinations).
The last route point is the final destination and the route is cut into different legs (from one destination
to the next).
Scheme
Clarion EZ Drive comes with different color schemes for the map for daytime or night use. Schemes
are custom graphic settings for the map 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. Clarion EZ Drive uses them when it
switches from day to night and back.
