I flew more than 4 months with this same frame and Navio+ without any problem, frame is made with 3k carbon fiber, and the motors and ESCs are really far from Navio2 board……As you can see in this video:
….But I can test with external compass, no problem.
Please, Hw is easy to setup for the external compass, but how can I test (command line?) to be sure the external compass is activated?