[masraum]

Seems like it might be worth getting a used or clearance smart phone to use for this purpose. You don't have to use any other aspect of the phone if you don't want to. That also gives you the option of using any navigation app that you want, Waze, Google maps, Garmin, etc.... You can probably get whatever minimal service would get you what you want/need. You will need a data plan since the app will probably be downloading maps. But with a little research, there may be some app where you can download maps at the start of a drive for the drive via wifi, and then not have a plan, but rely on GPS only. I think these days most apps may require a data plan, but I'm not sure.