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- Reservation
Prerequisite: None
General Description: Able to demonstrate the Celestial Navigation theory
required to safely navigate a sailboat on an offshore passage. The practical
application is conducted in the Offshore
Passagemaking Standard.
A Certified Sailor has successfully demonstrated his or her ability to:
- Convert longitude into time.
- Convert standard time and zone time to GMT and vice versa.
- Calculate the zone time given longitude.
- Calculate the chronometer (or watch) error given a previous error and the
daily rate.
- Apply the corrections for index error, dip of the horizon, and total correction
to convert sextant altitudes of the sun, stars, planets, and moon to true
altitudes.
- Calculate the time of meridian passage of the sun and calculate the boat's
latitude from the observed meridian altitude of the sun.
- Determine the latitude at twilight by means of the Pole Star.
- Solve the navigational triangle using a navigation table and show all appropriate
work.,
- Plot celestial lines of position on a Mercator projection or on a universal
plotting sheet
- Calculate the times (ship's and GMT) of sunrise, sunset and twilight.
- Determine the approximate azimuths and altitudes of the navigational stars
and planets at twilight.
- Calculate and plot the lines of position obtained from observations of
several celestial bodies at twilight and thus find the boat's position.
- Advance the LOP obtained from a sun sight to another LOP obtained from
the sun at a later time and find the boat's position using a running fix
(sun-run-sun).
- Calculate the true bearing of a low altitude celestial body in order to
determine the error and deviation of the compass
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