REFLECTOR: GRT compass calibration

[Terry Miles]

Hi all,

I have a dual screen, single AHRS GRT EFIS (Their Horizon I)  and I am
getting a 20 degree compass split.  The GRT is reading off to the right.  

I am in contact w/ GRT and doing and trying all as they advise, but I
thought I would check in here to prevent re-inventing the wheel.  I do enuf
of that as is.

The Magnotometer is mounted in the RH strake and I have the usual #2 nav and
com antennae near by not on top off the GRT magno box.  I have about 3 feet
of excess cabling.  Moving that around in the wing and aft cabin has no
affect on the problems.  

The plan of attack tomorrow is remove the canard cover and see if I can
isolate the magno cable from any possible unnoticed offenders in the nose
area.  

Anybody been down this road?

Thanks,
Terry