Well try these for size; http://www.sparkfun.com/datasheets/IC/HMC105X.pdf and prices here; http://parts.digikey.com/1/parts/947939-sensor-magnetic-3-axis-16-plcc-hmc1053.html Calibration can be achieved in-situ quite happily, at least for the sort of accuracy I need, I'm not expecting template accuracy merely sufficient to act as an aid to alignment so that images are arranged in an appropriate grid. Also having now used the Solmeta Pro GPS with 3-axis compass for a couple of years it works quite happily for the purpose above. I'm also quite sure that over time accuracy will improve and costs likely fall at the same time.
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