Maps, GPS ring any belll?

Okay we all know they are so many gadgets for GPS and being in US pretty much even going to the neighbourd gas station or walmart we go mapquest or google maps ...but where the hell all these data comes from ....and makes sure that most of the times we get the correct directions...

Here is the answer to it the TeleAtlas

if you know anything about GPS devices, you’re probably familiar with Tele Atlas. This international corporation, which has its American headquarters in Boston, provides the GPS data for an array of device manufacturers, such as TomTom, Pharos and Navman, automobile makers including BMW, Ford, Honda and Toyota and Web sites like Google and Mapquest. As many GPS users know, the data available from these sources can quickly become out-of-date, frustrating drivers who turn down a wrong way and end up at a dead end.

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