OICNW Task 1.7.C

Determine magnetic compass deviation

MMA Method

In order to satisfy NVIC 12-14 Task 1.7.C , MMA students must:

NVIC Method

See NVIC method.

STCW Competence Knowledge, Understanding, and Proficiency

Plan and conduct a passage and determine position

OICNW-A1.07 Compass – magnetic and gyro

Ability to determine errors of the magnetic and gyro-compasses, using celestial and terrestrial means, and to allow for such errors
Condition Behavior Standard

On a vessel underway or on a simulator equipped with both a magnetic and gyro- compass using navigational or natural terrestrial ranges, using only a magnetic compass, and a chart with variation,

the candidate notes the vessel’s magnetic- compass heading while aligned on the range and determines magnetic compass deviation.

The candidate:

  1. Compares the magnetic compass heading to the charted range bearing;

  2. Determines the magnetic compass error and properly labels it;

  3. Determines variation from the chart;

  4. Determines the magnetic compass deviation to within ± 1.0° of the assessor’s solution; and

  5. Correctly records it in the compass record book and the ship’s log.