Someone on this site recommended Maplets and I used it on this summers tour through Missouri Kansas Nebraska South Dakota Wyoming and Colorado . You can download the state bicycle map from dept of transportation . They show volume, and shoulder width. I have iPhone 6 plus so my phone is pretty huge. You don't need to be online to use the map , which is in PDF format. The good thing about it is it shows your location ( blue dot) using your phones gps without being connected.