never had any need to adjust the compasses on our ribs. Vhf is a foot or so away and the mic is nearer but now they dont have a magnet and cone thing in them they dont seem to affect compass. I always plug new kit in, turn it on and wave it around the compass before fitting to see if there is any efect.
adjusting-just found instructions for last compass with the following advice- none of which we had to use!
Use chart to determine a north heading and steer boat on it of N doesnt line up use compensation rod on right hand side to adjust til N is right.
Now head to an east heading and if compensation is req then adjust using rod in front of compss until E lines up
Head South and if heading is not correctly shown adjust the side comp rod to take out half the error
Head west and use front comp rod to take out half of any error
Repeat the steps as above taking out half the error at each adjustment until req accuracy is achieved.
If you cant get it right you may need to move something or indeed the compass itself.
Use a non ferrous/non magnetic screwdiver to do the adjustments.
Steven your compass should work-consider if it is a compass weighted for the N Hemisphere. Cos the pull from the poles is downwards, as well as up as it were, the indicator of a compass may be weighted to compensate for the downward pull which will be on the other side where you are on the underneath bit of the world