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Well , Yeah actually I'm planning to calibrate it right before every operation with a quick push button click ... So that It can assume the present values as exact zero .. It's all about math I guess...

That was a nice a explanation Richard ... As you've previously said , we can at least use this IC to observe the pitch then ... For example I'm intending to read XZ or YZ to see the pitch angle for...

I still can't understand which vector shows me the magnetic north in this picture ... But as far as I read the datasheet of this IC , it mentions about a term called Hnorth which is the resultant...

So according to your code , we get x , y , z raw readings as byte datas .... and xy xz yz calculations obtained using some trigonometry .. But what do those datas mean ? I think these xy xz yz...