thanks for all the input, and a Big thanks to Bob M for the pedestal guard - have to get the feet and bracket and install. . .
question to all - I've noticed in pics of setups that chartplotters seem to be close to the compass - is there a minimum distance that needs to be maintained between the instrument and compass? Standard Horizon tech support told me "several feet", but that doesn't seem to be the case with what I've seen. . .
All electronics can interfere with the compass. It is always best to have a competent compass adjuster come to your boat, swing the compass with the electronics on and off, and make you the deviation cards.
With my mount above the unit can easily be removed and your compass is no longer affected, provided you have a deviation card for that scenario as well.
In this day and age it seems no one cares about compasses, not Garmin, not Raymarine no one, not even boat owners or boat builders. I just came back from the Annapolis show and 7 figure boats have 12" plus plotters mounted 6" from a magnetic compass.....
That said its not just builders most boat owners could care less too. I can't tell you the last time I was on a boat that actually had a deviation card, including the one that left for the Bahama's last week....
I still prefer to have a well calibrated professionally swung compass and my electronics at the helm. Most of them can be swung and deviation cards made even with electronics close by....