In my searching for a map app that would be useful if the phone couldn't get a cell signal or wi-fi, I found this. So far I've downloaded DC and some counties in Virginia (Arlington, Fairfax). [ $1.99 ]

https://itunes.apple.com/us/app/city-maps-2go-offline-map/id327783342?mt=8


City Maps 2Go - Offline Map and Travel Guide

Interactive offline map PLUS Wikipedia travel guides for the whole world. INCLUDING unlimited map downloads. 100% offline. No data roaming or WiFi required. The most downloaded app of its kind. Ideal for trips abroad and at home.


.