So in the previous post, I outlined what Geocaching Radar is. The mobile application I'll share with you uses co-ordinates from a connected GPS to on a button press take you to the Geocaching website to find caches nearest to your current location.
We make use of the Windows Mobile 5 / 6 intermediate GPS driver for simplicity. For Smartphone users you'll need to download the Windows Mobile 6 SDK which has a utility for setting up the intermediate driver. Download SDK here
If you'd like the source of this application, drop me a mail and I'll happily share.