Geo Tracking based on GPS

Hi Everyone,

I am developing Geo-Tracking application. I am tracking device based on different methods like:

Tracking based on IP address

Tracking based on Wi-Fi

Tracking based on GPS.

I want to implement tracking based on GPS. I am using VC++.

Please suggest me any third party library available or windows API, using which I can implement my Geo-Tracking based on GPS.

Thanks in Advance,

Nilesh