Originally Posted by njkayaker

It looks like this has the "openfiets/bicycling" map problem. That is, this version/compilation of the OSM maps is not really useful for routing in the US.

What I mean by "routing" is having the Garmin compute a route to a particular place (like people typically do for car GPS nav units).

As it happens, just by luck, I have a destination that produces a wacky detour when the map version is "bad" (compiled for bicycling in one way or another).

Basically, the problem is that many roads that are used for cycling in my area are classified in OSM as "primary". The "bicycling" versions of the OSM maps lump these streets with "highways" (roads that you would not really ride a bicycle on).

You need the "primary" roads for sensible/useful routing but with the "bicycling" versions, you either also get highways (bad) or the don't "exist" for routing.

For the US, you want the normal (not bicycle-specific) OSM maps and you want to "avoid highways" on the Garmin if you use the unit to compute routes.