Don't rely on google maps because the electricity my be off and the internet down. Have paper maps on hand. While state maps are fine, you'll want to know the back roads so get a local or county map showing little known roadways. Here, they're offered free at the Chamber of Commerce. If not so in your area, print out copies from maps of your area off the internet. Topographical maps are good to have.
Amazon and Walmart have these in stock. Never know when you’re going to need an alternate route.
http://shop.delorme.com/OA_HTML/DELibeCCtpSctDspRte.jsp?section=10096