Celestial Navigation Standard (ASA 107)
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.
Schools Offering Celestial Navigation (ASA 107)
Blue Water Sailing School Ft. Lauderdale, FL
Bluewater Sailing Marina del Rey, CA
California Sailing Academy Marina Del Rey, CA
Chapman School of Seamanship Stuart, FL
Florida Yacht Charters Miami Bch, FL
Lanier Sailing Academy Bufford, GA
Lord Nelson Charters,Ltd Lake Lanier Islands, GA
The Maryland School of Sailing Rock Hall, MD
Modern Sailing School & Club Sausalito, CA
Tradewinds Sailing Club & School San Francisco, CA
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