Originally Posted by Steve B.

This

Gaia GPS is used by a lot of the overlanding community. Likely has the best data base off non-paved roads that I've seen. It uses their own topo, plus/or National Geographic, and/or USGS Topo. Nothing is really and completely up to date, I was just watching an overlanding guy in a Wrangler on the logging roads of northern Maine. I believe he was using Gaia. He did comment on how the computer map had errors but this is to be expected as the companies that own the land do not update for the public.

But your on a bike so it's sometimes easier to get past a bridge washout or such where a vehicle could not.