What is the correct sequence for finding PSC from True to Compass?

The correct sequence for finding the compass heading from true heading involves converting the true heading to the compass heading, which accounts for the local magnetic variation. When determining the compass heading from true heading, you need to first apply the local magnetic variation, which can either be east or west depending on your geographical location relative to magnetic north.

By taking the true heading (the heading that is correct relative to geographic north) and applying the magnetic variation, you get the magnetic heading, which is the direction indicated by a magnetic compass. This conversion step is critical for navigators, as the compass must be oriented to the magnetic field of the Earth.

Once you have the magnetic heading, you can derive the compass heading by accounting for any deviation that your specific vessel's compass may have due to local influences or inaccuracies. This involves adjusting for compass error, which affects the final representation of the vessel’s direction on the compass.

Thus, the procedure to find the compass heading accurately goes from true heading, converting it to magnetic, and finally adjusting it for compass error to arrive at the compass heading. All these steps highlight the importance of correct sequencing during navigation to ensure a safe and accurate course.