I am looking for a tablet for my local fire department that would serve solely as a large GPS unit. It would be placed in the fire engine and used to show where the truck is in correlation with upcoming streets as well as th route to a specific address (Google maps would work fine). Just looking for a reasonable tablet that has GPS, and I understand that the maps would need to be pre-downloaded prior. The GPS can be internal or external, doesnt matter. Also I would like it to have the option avaliable for 3G add-on, just in case we would like to expand the uses and be able to access the internet while on the road.