Well, it doesnt work in airplane mode. I assume that turns GPS off?
Reset the data counter, switched back to phone mode.When I got home my usage was :sent 77.0KB /received 441KB .
The only problem is that could have been when it checked for email?
According to a couple of sites though, Navigon does NOT use any data,so you can use it abroad no problem.
One thing though, it drains the battery fast!! In about 35 minutes went from 100% battery to 70%
.
So really need to use with a charger.