Getting Compass Heading

[Stech]

When using QGroundControl, I get the heading data of 270.  Where do I get that data in the nav data in AR-DRONE?  QGroundControl is obviously grabbing and/or calculating it somehow.

Any pointers would be very much appreciated.

Sample of the nav data from node-ar-drone navdata response.

magneto:

 { mx: -57,

   my: 37,

   mz: -107,

   raw: { x: -129.2109375, y: 200.390625, z: 388.7109375 },

   rectified: { x: -129.2109375, y: 200.390625, z: 388.7109375 },

   offset: { x: 0, y: 0, z: 0 },

   heading:

    { unwrapped: 0,

      gyroUnwrapped: 0,

      fusionUnwrapped: -106.2732925415039 },

   ok: 0,

   state: 0,

   radius: 0,

   error: { mean: 240.25021362304688, variance: 73.8359375 } },

[Stech]

We solved the silly problem.  Details and results are listed in our blog.

http://shredsts.com/2014/08/node-ar-drone-corrected-magnometer-heading/