On 8/30/2012 12:27 PM, mike wrote:

GPS is another issue.
Depending on where the satellites are at the moment, a smart phone
on your belt in the car may not work well. A Bluetooth GPS on the dash
can work much better and still talk to your phone or Pda.
But you can buy a whole GPS appliance for less than the cost of a bluetooth
GPS these days. And both are cheaper than a typical cell plan.

There are window-mounts for many popular smart phones that allow for
good GPS reception, and of course when using a smart phone as a GPS you
probably don't want in on your belt where you can't see the maps. The
bigger issue is that the screen on most phones is too small to make it a
good GPS, and the screens on larger phones make the phone too big to
make it a good phone. A 7" tablet makes a good GPS though.