Lookup country for GPS coordinates without Internet access

Question

I need to find out in what country given GPS coordinates are, on a device that has no Internet access (e.g. this, but without the easy on-line solution). Having no experience wi

Answer 1

You would need a map with the boundaries of each country. Then, given a coordinate, you would need to calculate in which boundary the point fell. Of course, the two challenges there are collecting the data and representing it, and doing the math to find where a point falls.

Does anyone know how Yahoo does it? Could you possibly port their approach locally?