Main shortcomings of GPS mobile phone global positioning system

But there are not enough positioning satellites under trees or in rooms and underground parking lots.

GPS mobile phone business has a huge industrial chain lineup beyond traditional value-added services, which consists of mobile operators, system equipment providers, terminal manufacturers, GIS developers, application providers, middleware providers and other links. It comprehensively uses technologies and applications including mobile communication, satellite navigation, Internet, geographic information system, integrated information service, etc. It is the product of multi-industry and multi-technology cross-integration. GPS mobile phone service needs continuous and huge investment, especially in network upgrade and electronic map.