Location information is received from a terrestrial location indicator device. The location information is based on location of the terrestrial location indicator device. Location information is also determined from a GPS satellite signal. The location of a device relative to an object in a map is determined based on the location information from the terrestrial location indicator device and the location information from the GPS satellite signal. The location information from the terrestrial location indicator device may be used to distinguish the device location relative to at least two adjacent objects, such as roads, in a map.

 
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< Housing for a GPS vehicle location device

< GPS rover station for synthesizing synthetic reference phases for controlling accuracy of high integrity positions

> Mobile communications device with GPS receiver and common clock source

> Signal folding coherent acquisition for weak global positioning system (GPS) C/A coded signal
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