The HMC6343 is a solid-state compass module with tilt compensation from Honeywell. The HMC6343 has three axis of magneto, three axis of accelerometer, and a PIC core running all the calculations. What you get is a compass heading over I2C that stays the same even as you tilt the board. Solid-state (and many classic water based) compasses fail badly when not held flat. The tilt compensated HMC6343 is crucial for those real-world compass applications. Who says robots have to stay flat? Project description, more information and ordering can be found at https://www.sparkfun.com/products/8656 Datasheet: http://www51.honeywell.com/aero/common/documents/myaerospacecatalog-documents/Missiles-Munitions/HMC6343.pdf Example PIC code: http://www.sparkfun.com/datasheets/Sensors/Magneto/HMC6343-Test-v11.zip Digital Compass How-To Video: http://www.youtube.com/watch?v=sBKHdt0OdPg Wiring Example: http://wiring.org.co/learning/libraries/hmc6343sparkfun.html