Hello @frank_wunderlich
I do not know what exactly the issue is with T865, but it apparently does not report the Tablet orientation like all the other devices. Maybe some software alteration was done to “lock” the display in portrait mode which causes the incompatibility. Maybe you could also ask the DMD guys if there is some setting that you could use to improve the situation.
On Kurviger side, in future they could offer settings that actually lock the navigation either in landscape or portrait mode - there are not many of us that really need that rotation button - you either ride in one or the other mode.
Meanwhile, there are apos that allow you to enforce desired orientation, and appear to do the job. See here: