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Where in the aircraft is your mag compass located? Generally speaking you
must locate it physically as far away as possible from anything that
generates electromagnetic radiation (flux fields). If you have it up high at
the top of the windshield, your interference problem may be coming from
electrical components in the ceiling...

Best Regards,

Larry Graves
AirCrafters Builder Education Center
Construction, Maintenance & Repair
140 Aviation Way, Watsonville, CA
831-722-9141
www.AirCraftersLLC.com

----- Original Message -----
> I just had a SIRS magnetic compass installed and we are experiencing
errors
> of up to 40 degrees.  
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