Celestial Navigation Standard (ASA 107)

A Certified Sailor has successfully demonstrated his or her ability to:

1. Convert longitude into time.
2. Convert standard time and zone time to GMT and vice versa.
3. Calculate the zone time given longitude.
4. Calculate the chronometer (or watch) error given a previous error and the daily rate.
5. 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.
6. Calculate the time of meridian passage of the sun and calculate the boat's latitude from the observed meridian altitude of the sun.
7. Determine the latitude at twilight by means of the Pole Star.
8. Solve the navigational triangle using a navigation table and show all appropriate work.,
9. Plot celestial lines of position on a Mercator projection or on a universal plotting sheet
10. Calculate the times (ship's and GMT) of sunrise, sunset and twilight.
11. Determine the approximate azimuths and altitudes of the navigational stars and planets at twilight.
12. Calculate and plot the lines of position obtained from observations of several celestial bodies at twilight and thus find the boat's position.
13. 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).
14. 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

Fair Wind Sailing School Harrison Township, MI

Fair Wind Sailing School Toledo, OH

Fair Wind Sailing School St. Thomas, USVI

Florida Yacht Charters  Miami Bch, FL

Lanier Sailing Academy  Bufford, GA 

Lord Nelson Charters,Ltd  Lake Lanier Islands, GA

Northern Breezes Sailing School Minneapolis, MN

The Maryland School of Sailing  Rock Hall, MD

Modern Sailing School & Club  Sausalito, CA

Tradewinds Sailing Club & School  San Francisco, CA

Upper Bay Sailing School Tortola, BVI

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