@KoiwiGal - To be honest I find the idea of a GPS tracking my every move on the job kind of creepy. I don't even like them being on my phone, because you know they are giving that information to all kinds of businesses.
On the other hand, my local bus route finally installed a GPS tracking system with a sign at the stop saying how far away each bus is. It's so much better than it used to be.
So, I guess I can see how it could make a business more efficient, but I still wouldn't like it myself.