Plastimo remote mount compass compensator for Plastimo Compass Models,Mini-Contest, Contest 101 & 130, Mini-B and Offshore 75 compasses -The compensator features screw adjustable fine tune compensation.This compensator is for correcting old style Plastimo Compasses to accommodate different Zones.Does my compass need to be compensated ?Magnetic fields generating interference on the compass performanceexist on all boats. The impact on the compass, called “deviation”, canoriginate from many different sources : metallic masses, loudspeakers,engine, electronic instrumentsIf deviation ranks between 7 and 20, your compass should indeedbe compensated.Plastimo Compasses are supplied with built-in compensation, or can be further equipped withan optional compensation cell. They are designed to be user compensated – Compensating a compass consists in adjusting the positionof the 2 magnets, in order to affect the horizontal component of the card by modifyingthe North/South and East/West deviation.How to compensate a compassUse a second compass as the reference ; a hand bearing compass is often the most convenient, providedit is interference-free. The North-South screw corrects North-South heading ;the East/West screw corrects East-West heading.Run the boat along the Northerly course selected as per your hand bearing compassand adjust your steering compass by turning the North and South screws either way,so that the steering compass also points North.Repeat the procedure, running the boat Easterly.Run the boat Southerly and this time, reduce the deviation by half.Run the boat Westerly and reduce the deviation by half.Note: Upon completing the compensation procedure, it is essential to draw a new deviation table.