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Homebrew tilt compensation?

Honeywell's datasheet on the HMC6343 compass states that tilt compensation is made using data from a built-in three axis accelerometer. I thought that a cheaper three-axis magnetometer- accelerometer combination is much more reasonable for small scale projects, so my question is: What kind of calculations do I need to perform to get a decent degree of accuracy?

 

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Parallax.com has a lot of great information and sample code.  I think they even have that exact model.

Thanks, I'll check it out

where did you get it. do you have a name for it?

please respond, usually the datasheet has some info on it

what do you mean by "it"?

the compass sensor