For those with a smartphone and want a great offline GPS system, Sygic works great! No need for a cell signal and all the maps are contained in your phone. I tried the free version and liked it so much that I paid for the full North America and Europe maps during one of their sales (I think it was $25 or so). It also works with GPS enabled tablets. I have it loaded on an ASUS 7" tablet that I got from Micro Center for $30. You can also add your own POIs. One unique feature of this one is in 3D drive mode, it shows the hills and mountains on the horizon as you drive! If you go through a pass, the hillsides around the road are shown. Difficult to describe but provides a semi-realistic view of what you should be seeing out the front of the vehicle.