Assessment OICNW-1-1C

Measure the altitude of at least 3 stars

Assessed in MT-4371 Sea Term IV: Marine Transportation


Aboard a ship at sea, given a standard marine sextant, a clear horizon, a clear or partly cloudy sky, and an accurate time, during a single twilight.

Performance Requirements

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

Measure the altitude of three stars and accurately record the times of the observation of each star. The candidate will then plot the three lines of positions and advance them to a common time.

The resultant position of the star fix is within 1.5 nm of the ship's GPS position at the corresponding time, or within 3 nm of the assessor's solution taken during the same time.

Supports Table A-II/1 officer in charge of a navigation watch

Competence Knowledge, Understanding & Proficiency Task

Plan and conduct a passage and determine position

A1.01 Celestial Navigation

Ability to use celestial bodies to determine the ship’s position

Measure the altitude of at least 3 stars

Published: 2016-10-28-04:00