OICNW-1-1C
Measure the altitude of at least 3 stars
Function: Navigation at the operational level
| 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 |
Assessed in: MT-4371 Sea Term IV Deck
Condition
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.
Behavior
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.
Standard
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.
