In a previous post - Dash Express - Finally a connected, crowd-sourced GPS, I had written about the DASH GPS device. The Dash is a two-way Internet connected GPS system like none other. And Amazon has it now for $299.99 and I am extremely tempted to buy it. The service still costs about $11.00 per month to use the 2 way Internet connectivity on the road - which uses cellular phone networks for communication.
Check it out at Amazon.com: Dash Express.