This past June during our trip through Germany I used my cell phone as my GPS. Naturally, when I got home I was hit with significant roaming charges from my carrier Verizon. We learned to use the cell phone only when back in the hotel or BNB when under someone else's wifi coverage. This May/June we are heading back to France and expect to be driving for about 7-8 days. I can rent a GPS through the car rental agency for about $100 for those 8 days or I can update my old GPS to Europe maps for about $50 from Tom-Tom. I would prefer to use my cell phone, but how one get around the roaming charges for GPS usage. Are there specific tricks that I should know about. .

Thanks very much