@georgem1956, I understand what you're trying to do, but this is an incorrect usage of these settings.
For any of the gimbal tilt settings to work the Mavic must be connected to the RC. This is because the Mavic automation engine doesn't support a tilt angle parameter and automatic control of tilt angle transitions. Put more simply, the Mavic can not control the gimbal by itself.
So, for any gimbal tilt angle changes, the RC much be connected so the Litchi app can change gimbal tilt through transmitted commands.
Now, that said, assuming the RC is connected here's how the gimbal settings work:
- Interpolate: Smoothly and linearly change tilt angle between two waypoints. Angle is user-defined in the waypoint settings.
- Focus POI: Works exactly the same as interpolate, except tilt angle is automatically calculate by Litchi, and will be recalculated if waypoint location or altitude is changed, or POI location or altitude is changed. FPOI also automatically calculates and adjusts waypoint heading.
If you are truly trying to properly frame a POI from several waypoints, you should simply use FPOI. In flight, it's indistinguishable from Interpolate. However, if you set up with FPOI, then change the waypoint to interpolate, it's almost guaranteed you will adjust one of the waypoints or the POI location while continuing to plan/create the mission, the heading and gimbal angles will be off, and you'll think something's wrong with Litchi when you run the mission.
Gang, Litchi works fine. If you're getting weird results, it's almost 99% certain it's a misunderstanding in how various parameters behave, and how to set things up.