From wiki, it says that :-
The Global Positioning System (GPS) is a global navigation satellite system (GNSS) developed by the United States Department of Defense and managed by the United States Air Force 50th Space Wing. It is the only fully functional GNSS in the world, can be used freely, and is often used by civilians for navigation purposes. It uses a constellation of between 24 and 32 Medium Earth Orbit satellites that transmit precise microwave signals, which allow GPS receivers to determine their current location, the time, and their velocity. Its official name is NAVSTAR GPS. Although NAVSTAR is not an acronym, a few backronyms have been created for it.
Basically, it use satellite to give the information of your location. and with some advanced application, you can see the area where you stand at. and you can make this GPS as to guide you to find which road to use to go specific location. hahaha nice what ??? well it good for people yang malas kan mengingati jalan and yg pelupa jalan apa yg diguna kn sal ia bg instruction jua.... hehhee here some device i use and map yang show where i am.
Holux GPSlim 236B
this is my way from office to my cousin house . the purple line hehehe iakah jua tu..
Holux GPSlim 236B
this is my way from office to my cousin house . the purple line hehehe iakah jua tu..