I tried the routing again on a day trip today. I was going to loop through a few towns out in the Ohio countryside but a flat tire about 8 miles in tied me up (didn't have a tube but I had a patch kit - I just had to find where the tube was leaking and that took me way longer than it should have).

In any event, the first thing I did before I rolled out was set a waypoint where I was going - about 26-27 ride miles away (not sure what the line of sight distance was, maybe 15-18?). The routing was absolutely worthless all the way to within 1/2 mile of the waypoint. The waypoint was in a state park and there is only one road in to the park and one way to navigate the roads - once in the park - to get back to where I was going, but the route guidance wanted me to go another 1/2-1 mile north.

In any event, I'll keep the route guidance off. I suppose I can try it in other areas to see what happens, but as for route planning my rides/trips - I'll keep doing things the old fashioned way.