OICNW Task 1.1.A

Adjust a sextant

MMA Method

In order to satisfy NVIC 12-14 Task 1.1.A , MMA students must:

NVIC Method

See NVIC method.

STCW Competence Knowledge, Understanding, and Proficiency

Plan and conduct a passage and determine position

OICNW-A1.01 Celestial navigation

Ability to use celestial bodies to determine the ship’s position
Condition Behavior Standard

On a vessel or in a navigation laboratory, Given a standard marine sextant with the capability for a perpendicularity error, side error, parallelism error, and collimation error,

the candidate detects and corrects adjustable sextant errors in accordance with industry standards.


Note 1 The assessment is not required for an endorsement that will be limited to near coastal waters.

  1. The candidate removes the adjustable sextant errors in the following order:

    a. Perpendicularity;

    b. Side error;

    c. Parallelism; and

    d. Collimation error.

  2. The candidate’s remaining index error is less than 0.5 minutes of arc as determined by the assessor.