Supposely there is now a way to do this in Google Maps (and any deviation from your orignal plan might mean you don't have map support, so be careful)...but I gave up on that and just paid for Navigon...with it you can download maps on a state-by-state basis so you know for sure you have all the maps you need (wise to do this downloading while on Wifi, not 3G/4G). I think there are several other Nav apps that have downloadable makes. With these, you don't need 3G/4G for map data and you don't need to use your data plan at all (all of that map downloading can eat through your data plan if you don't force the maps to download and save ahead of time), but you do need the GPS chip in the iPad, so you need to have the 3G/4G model or the wifi model with a GPS receiver that connects to your iPad via Bluetooth. You can get one of these on Amazon. They work very well and have wider use than for just your iPad.