I'm having difficulty extracting reliable MAX2 camera compass heading metadata from .360 files.

Is is possible in outdoor conditions to get reliable compass headings from MNOR (or other messages). If so how? In my use case the camera is hand held, so I cannot rely on the camera velocity vector to determine the heading/camera pose.

I'm currently using the free telemetry extractor at goprotelemetryextractor.com and looking at the MNOR message. I can't find documentation that defines in detail what the 3 floating point values of the NMOR message are. It seems to be a unit vector. I would have thought those values would be vector {i,j,k} where magnetic_heading = atan2(j,i) radians. But when I plot the vectors on a map it does not make sense. I've tried the vector components in other orders also, but none match the real camera headings.