Nextar ME ME Software Manual - Page 119

Glossary

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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. You can save and load routes in Nextar Navigation System, 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 quit Nextar Navigation System. See also: Route. 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 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. 118

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118
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. You can save and load routes in Nextar
Navigation System, 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
quit Nextar Navigation System. See also: Route.
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 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.