Where on a nautical chart is magnetic variation shown, and how is it used to convert true bearings to magnetic bearings?

• A. On the margins of the chart; true-to-magnetic conversion uses East variation as described on the margin.
• B. In the legend; variation is not used for bearings.
• C. On the compass rose; True to Magnetic = subtract East variation, add West; Magnetic to True = reverse.
• D. In the title block; variation is shown but not used for bearings.

Answer: (C)