Determine magnetic compass deviation


On a ship underway or a full mission ship simulator, using navigational or natural terrestrial ranges, using only a magnetic compass, and a chart with variation.

Performance requirement

Behavior Standard
The student will: During assessment, the student shall, at a minimum:

Note the vessel's magnetic compass heading while aligned on the range and determine magnetic compass deviation.

  1. The magnetic heading is compared to the charted range bearing.
  2. The magnetic compass error is determined and properly labeled.
  3. Variation is determined from the chart.
  4. The deviation solution is ± 2° of the assessor’s solution.
  5. The deviation is correctly recorded in the compass record book.

Note: This assessment supports KUP OICNW-A1.06, and is assessed in MT-4133 Bridge Resource Management.