Android : Android- How to find vector of magnetic moment?

I am trying to find the vector of magnetic moment using magnetic field components along every axis.

Can someone help me what should be the best way to do it?

My first idea was to record magnetic field at some point (which I choose, well-known distance from magnetic sensor), but I never had correct values.

I have used these equations http://en.wikipedia.org/wiki/Magnetic_dipole.

Thanks in advance, and I hope so that someone did similar things.

Best regards, M