Skeeter, just found an App that I'm going to try out on the iPhone.
http://www.garafa.com/GPSKit/Home.html
That App has a real-time GPS tracking feature called "Squawk".
Squawk used to be called "Radar" but the website hasn't been updated yet.
Here is a youtube Vid of it in action:
http://www.youtube.com/watch?v=fsGL8HVo-pM
That will enable my wife to know my location if something would ever go wrong and don't return at a pre-arranged time.