Where do they get 9 axes from? If it's a heading chip it is on one axis only!
I know Raymaribe are highly inventive on prices, I hadn't realised they'd developed hitherto unknown multi-dimensional physics too.
To get a tilt corrected compass on a vehicle that moves in 3 dimensions you need a 3 axis magnetometer, a 3 axis accelerometer, and a 3 axis gyro - add that up and you get 9 individual sensors.
