It's GPS. According to here, GPS, which stands for Global Positioning System, is a radio navigation system that allows land, sea, and airborne users to determine their exact location, velocity, and time 24 hours a day, in all weather conditions, anywhere in the world. The capabilities of today’s system render other well-known navigation and positioning “technologies”—namely the magnetic compass, the sextant, the chronometer, and radio-based devices—impractical and obsolete. GPS is used to support a broad range of military, commercial, and consumer applications.
in simpe word, GPS is tool to find out where we are. The location served through display with coordinate. For end user, it is important to installed map data in GPS tool to help making orientation. Basically position information given by GPS is in coordinate, so if you are not familiar with this term, the map will help you with it.
Many vendor like Nokia is equipped their mobile phone with GPS built in, including map data. What's in the map? The map here shows road complete with name information, also there is POI (point of Interest) describes ATM (Automatic Teller Machine), Fuel Station, Restaurant, etc. These object is useful when we are looking for nearest ATM--example-- from our current location, and thanks to GPS, it will help us to find it.
In my country with very large and wide area, Nokia doesn't give complete map area. The map given is only for major cities which is understable because most users of mobile phone live in cities. But it will become alittle problem when users going out from city. The use of GPS will abate due to the un
available map covered.But hopefully, this condition will be decrease more and more in the future, along with the increase of GPS phone demand and the popularity of GPS it self not just in the city comunnity, but in village as well.
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