I am going to install a compass and a Garmin 440 Chart plotter which will also work as the depth sounder. I want to install them both in the cockpit on the bulkhead that is on the port side of the companion way. I will cut out a hole in the bulkhead for the compass and mount the chart plotter on a bracket. I want to mount both the chart plotter and compass on the port side, because I will be running the halyards on the starboard side ( I am right handed). My question is how close can the compass to the chart plotter without getting magnetic deviation.
Any comments or suggestions regarding my proposed layout will be welcomed.