I'm working on a sensor pack which will measure azimuth, inclination and roll. Currently I'm involved in literature review and parts specification with a leaning towards Honeywell's magneto-resistive magnetometers and an Analog accelerometer. Both Honeywell and Analog provide excellent application notes and support, but the input of any board members would also be appreciated, specifically direction to further online research sources. Thanks, Shawn -- http://www.piclist.com hint: To leave the PICList mailto:piclist-unsubscribe-request@mitvma.mit.edu