Paper maps...
If you don't have a stock of them, they are getting harder and harder to find. Bookstores are still carrying them, last I looked, but I recently asked several other stores that used to carry them including a national chain drugstore and the manager laughed and said I was the first person this year that had asked for one; that they stopped carrying them a couple of years ago because "everyone" is using GPS on their smartphones.
Hmmm, when the power and/or web goes down, what will these people do? What will you do, if you're trying to navigate rural roads in an unfamiliar area?