User manual

MapAsia MapKing™3D
5 GPS Positioning
IMPORTANT MESSAGE CONCERNING GPS (Global Positioning
System) TRACKING
The GPS tracking function of MapKing™ works on GPS satellite signals broadcasted for
civilian use. It is subject to inherent signal deviations and environmental interferences
caused by surroundings and bad weather. We cannot guarantee nor specify a precise
level of accuracy for the GPS positioning data displayed by MapKing™. It should also be
noted that the Unites States Department of Defence, who builds and operates the GPS
system, is free to turn off or downgrade the civilian signals of GPS during rare occasions
like regional military conflict. Although MapKing™ should work with most GPS receivers
on NMEA0183 signal output format regardless of their brand name or model; we cannot
guarantee that MapKing™ integrates flawlessly with ALL GPS receivers available in the
market.
Please read the package for product information for product support GPS.
In this chapter we will discuss how to setup, operate the GPS functions and the functions
provides by MapKing™ G10with GPS.
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GPS (Global Positioning System) is developed and maintained by the US Defence
Department. The system was initially deployed for military use but was later open for
civilian navigation. The system comprises of 24 satellites on different orbits. The GPS
receiver on the ground picks up signals from at least three satellites and calculates its real
time position by a set of mathematical formulas generally known as “triangulation”.
GPS receivers must maintain line-of-sight with the satellites. GPS won’t work indoor and
its accuracy tends to degrade significantly when the receiver is located under sheltered
area or near high-rise building structure or terrain.
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