I'm developing a program to be running on portable computers like PDA/Notebook, and I need to use GPS to calculate things like, physical distance between the user and a train station, and will remind the user to walk quicker if he's gonna miss his train.
Since I have never had experience on GPS and PDAs, I was wondering if somebody has done things like this before, or can tell me what I need in order to achieve my idea.
Thank YOU
Kenji Chan