That's what I thought too, so I wanted to know if there were any issues with the guys that have them on CCs. I thought a few people bought them when they went on sale in November.

Do a Google search on "740s compass" and you will find plenty of discussions on the subject. Most say it is the magnetic door where the SD card goes which can interfere with the compass though it could be electromechanical (electromagnetic?) interference from the screen or somewhere else in the Garmin. I remember one of my VHF radio instructions said the same thing. They are probably just trying to cover themselves from liability due to inaccurate compass readings. Just move the unit around with it on when you are mounting it and see if the compass reading changes. Most seem to say it is not an issue. Garmin usually answers the phone from my experience and is very helpful so you could call and ask.

My 640 is a little smaller but it has an internal antenna and is mounted within about 6" of my compass. It doesn't seem to cause any problems with the compass.

I saw a new in box 940s on CL miami for $900 today