Jim,
Tablet rotation is typically based on the internal gyrometers.  If not locked, you would rotate the tablet beyond 90 degrees for most tablets and auto-rotate feature of Android switches from landscape to portrait, or visa versa.   This is a bad scenario for yoke mounted tablets, even if you put it on a yoke and do a steep coordinated turn "ball in the center", the tablet would still rotate the screen.  
I think have a floating button to appear to confirm screen orientation upon rotating the actual tablet would be a best default. Maybe an option in Screen Settings there could be an option to "Allow Auto-Orientation".  Just a thought.