Magnetometer Reading Question

[SupermanPrime01]

Hello,

I was wondering if the magnetometer values I'm getting when I type "rostopic echo /ardrone/navdata" are raw values.

I'm trying to figure out the AR 2.0's heading vs. magnetic North using the magnetometer reading but the magX and magY values seem to be a negative value most of the time, which doesn't make sense to me.

Thank you