On Wednesday, December 12, 2012 2:33:45 PM UTC-5, John Galloway wrote:
... How far
away from various sources of electromagnetic interference should
the ADC be installed to allow for present or future functions
requiring the magnetometer? I can't see any reference to this in
the manual or tech notes on the website.

6 feet from the movable magnetized rudder pedals should do it.
Of course, I've seen a glider whose compass moved ~ 20 degrees
on retracting the landing gear (no kidding) !

Seriously, there are a lot of (not-demagnetized) movable
parts in the cockpit...

See ya, Dave