Using the geographical coordinates of the earth’s surface on mobile or smart phone, you must have the features of Global Positioning System (GPS), internet via either GPRS, Wi-Fi or Edge and any API of Map e.g. Google API map, Yahoo API map and MSN API map etc.
For setting the latitude and longitude inputs on your mobile, you must always remember these points:
Latitude is always given before longitude (89° N 170° E)
Latitudes are parallel, but longitudes are not
Degrees West and South are sometimes referred to as negative degrees (-34° -68° is the same as 34 S 68 W)
A place's latitude effects its climate, but its longitude does not
Key longitude lines are the Prime Meridian (0°) and the International Date Line (180°)
Key latitude lines include the equator (0°), tropic of cancer (23° 26' N), tropic of capricorn (23° 26' S), the Arctic circle (66° 33' N), and the Antarctic circle (66° 33' S)