Select internal or externa compass

Hi alls,
I have a big problem to configure correctly my Block M8N + compas on my APM2.8.
In APM Planner, I don’t understand witch method to select internal or external compass? I think internal compass is always active.
I have removed the jumper on APM2.8 same problem.
TNT’s for support.

Check out COMPASS_* parameters

thank you, I have activate external (see my dump) but compass indicator on left screen is not credible (slow, not correct, ), and when I disconnect my external, the internal compass is always full active and azimut correct. I think there is a conflict between compass internal ans external…or internal is never disconnected.

Solution to disconnect internal ??? (jumper is out)