Yes, it does actually work. I can't go into too many details, due to my employer.

There are different ways to do this either via GPS signals or by cell/sector determination. Many websites can explain this.

But during testing, your position can be determined down to 67 feet. The only place this is active is in Rhode Island currently and has actually saved a boater during a 911 call. The downside of this is that the PSAPs (Public Safety Answering Points) have to come up with the money to support these features and as we know, funding to the public services can be tough.

But as Brian stated targeted advertising is a way for the carrier to generate revenue due to the mandatory implementation of this.

I'll just say this. In the next short time, you can subscribe to a feature to track your fleet, find your phone and when you drive by Cabelas (or where ever) you might get an SMS saying "stop in now for 20% off any item". But you can always opt out of this.

But as you, I wish my Treo 600 could be used with a moving map. Working on that. <img src="/images/graemlins/grin.gif" alt="" />

--Chris