Question : Developing GPS applications

I am a .NET prgrammer looking to develop a tracking program that will display the path of an individual carrying a GPS device. Has anyone dome anything similar? i am wondering what the best approach would be - a J2ME application that posts to a .NET web service? or some kind of off-the-shelf client software that can run on a Garmin device with an interface to GSM modem that will then post to the web service?

Any advice on starting points would be appreciated.

Answer : Developing GPS applications

I suggest to evaluate SPOT. It is a ready-made satellite-based solution.
http://www.findmespot.com/en/