I know you said no smart phone.. But one option is to get an old/used smart phone (with GPS) and install a stand alone nav app with built in maps. You can use GPS on your smart phone without using any cellular data. This is what I do when I'm in the US. I use Garmin's Navigon app for iPhone which has it's own maps so I don't have to use any cellular or wifi data while using the GPS app.
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