ASA 117, Basic Celestial Endorsement
Able to apply basic celestial navigation theory and practice to determine latitude and longitude at sea using a sextant and Nautical Almanac.
1. Describe the terms and theory of Basic Celestial Navigation.
Using a traditional sextant and Nautical Almanac and without the use of a programmed calculator or computer:
2. Convert between standard time and zone time to GMT/UT in either direction.
3. Calculate the zone time at a given longitude.
4. Determine the times of sunrise, sunset and civil twilight for a vessel’s position.
5. Describe and identify the parts, principals and operation of a traditional sextant.
6. Determine altitudes of the Sun and Polaris by a traditional sextant.
7. Obtain Latitude and Longitude at noon (LAN) by applying the sextant corrections for conversions of the raw sextant altitudes (hs) of the Sun to the true celestial altitudes (HO) of the Sun.
8. Determine the vessel’s latitude and Estimated Position at morning and evening twilight by means of the altitude of Polaris.
9. Plot latitudes and EPs on a chart.
There are 21 ASA Certified Sailing Schools that teach ASA 117, Basic Celestial Endorsement
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Once you have passed your ASA 117, Basic Celestial Endorsement you may find the following Endorsement Courses to be beneficial
Learn to observe and forecast weather conditions using traditional maritime skills and modern technology. Knowledge of weather information for planning and adapting navigation during short duration and extended voyages.
Learn to properly use small-craft radar (or radar simulator) for piloting, navigation, and collision avoidance. Knowledge of radar principles and practical matters of radar operation.