Anyone know offhand how to find out which companies provide GPS services to which cellular companies? I use VZNavigator on Verizon, love it to death, but have noticed a couple areas around Charlotte where the roads have changed or moved and want to send in updates. Yes, I know, no surprise coming from traffic boy over here

Oddly, Google hasn't been too helpful in this venture, so I thought I'd tap the Borg here. Thanks in advance.