Will I be charged data roaming expenses if I use my Navigon app from the US to Canada? For instance. If I'm driving from Seattle USA to Vancouver Canada and I cross the Canadian border and the service provider switches from AT&T to Rogers, will I incur data roaming charges for using the Navigon App. If I'm in a week in Canada just using GPS with data roaming turned off, do I have to turn it on to be able to use the Navigon App in Canada? I thought that the GPS receiver is different than the phone or wireless receiver for internet.