I use Google for mapping out long distance tours in areas I don't know. Often it takes me on gravel roads. I can't tell from the app that is not really road bike friendly till I get there. This can really mess up my plans (since I may I have to back track and go around adding hours to the day and getting to my camping destination.
That said - any favorite apps for bike travel - camping? Maps? (I do have warm showers! Love it for emergencies!)