I am having a terrible time getting the compass to consistently work while I am driving. It keeps giving me the interferance error and says I need to recallibrate. It happens in my H3 and my MX-5 as well. I try to keep it far away as possible from the stereo. The only thing I can think of is that the H3 has a electronic compass built-in the rear view mirror. My MX-5 still has the same issues, but it doesn't have a compass/ nav unit. Does anyone have any similar issues with their compass? I don't know what else I can do. I really was excited about this new feature. Thanks for the help, let me know what you think.