I've been enjoying my Rider 400 that replaced a Zumo 550 a lot. Now I want to ride an allroad route, with some offroad sections (trails). When I imported the original track in the TT400, the devices recalculated the track to kwown roads. It seems the TT400 map is missing the trails, although these are found on the "Open Street Maps" and are legal to ride on.
It would be great if the TT400 did not recalculate the track, even when a part of the track is not included in the installed map. Thats the reason to use an original GPX track instead of a route, just to follow the "sand trail".