Does anyone know of a GPS API for Windows (in C++) that will work with any reciever? Thanks in advance.

I don't know any off hand, but implementing one is easy and shouldn't take you very long.

It is as simple as opening a connection to the device (usually a serial port) and parsing some strings (NMEA 0183). Even though the NMEA standard isn't free there are plenty of sites out there that have GPS string definitions and a break down of them.

Here is a blog post with an example in c#

http://blogs.msdn.com/coding4fun/archive/2006/10/31/912287.aspx

Cool, thanks for the link. I'll do some reading :)