Hybrid positioning systems for the mobile location using several different positioning technologies . Usually GPS ( Global Positioning System ) is one major component of Such systems, combined with cell tower signals, wireless internet signals, Bluetooth sensors, IP addresses and network environment data. 
These systems are especially designed to overcome the limitations of GPS, which is very accurate in open areas, but works poorly indoors or between tall buildings (the urban canyon effect). By comparison, cell tower signals are not hindered by buildings or bad weather, but usually provide less precise positioning. Wi-Fi positioning systems may give very accurate positioning, in urban areas with high Wi-Fi density – and depend on a comprehensive database of Wi-Fi access points.
Hybrid positioning systems are increasingly being white Explored for some civilian and shopping location-based services and location-based media , qui need to work well in urban areas in order to be Commercially viable and Practically.
Early works in this area include the Place Lab project, which started on 2003 and went inactive in 2006. Later methods and smartphones combines the accuracy of GPS with the low power consumption of cell-ID transition point finding. 
- Assisted GPS
- Indoor positioning system (IPS)
- Mobile phone tracking
- Positioning system
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