Get the free Sight Reduction Worksheet HO249 Sight Data Almanac
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Sight Reduction Worksheet (HO249) Sight Data # Almanac LA Sextant Body Bearing DR Lat (N×S) DR Lo (W×E) SHA GHA h HS IC (on / off +) Ht of eye (m×ft) m s v (+/) (planets, Moon) Dip () Ha Time Date
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How to fill out sight reduction worksheet ho249
How to fill out sight reduction worksheet ho249:
01
Start by gathering the necessary information. You will need the date and time of the observation, as well as the latitude and longitude of your location.
02
Use celestial navigation tables, such as the Nautical Almanac, to find the data for the celestial bodies you observed. This includes their GHA (Greenwich Hour Angle) and declination.
03
Record the observed sextant altitude of the celestial body. This is the angle measured between the body and the horizon using a sextant.
04
Calculate the intercept, which is the difference between the observed sextant altitude and the predicted or computed altitude. This is done by subtracting the computed altitude from the observed altitude.
05
Determine the azimuth angle, which is the true bearing of the celestial body from your location. This can be calculated using the observed sextant altitude, latitude, and declination.
06
Fill out the sight reduction worksheet ho249 by entering the relevant information in the designated columns and rows. This includes the date, time, latitude, longitude, GHA, declination, observed sextant altitude, computed altitude, intercept, and azimuth.
Who needs sight reduction worksheet ho249:
01
Navigators: Sight reduction worksheets, such as ho249, are commonly used by navigators who rely on celestial navigation techniques to determine their position at sea. These worksheets help them calculate their latitude, longitude, and course.
02
Sailors: Sailors who venture into open waters without access to GPS or other electronic navigation systems often use sight reduction worksheets like ho249 to plot their positions and navigate their vessels.
03
Mariners: Mariners, including commercial ship operators and yacht owners, may utilize sight reduction worksheets to enhance their navigational skills and provide a backup method of determining their position in case of equipment failure.
Overall, anyone interested in celestial navigation or needing an alternative method of determining their position without relying solely on GPS can benefit from using sight reduction worksheet ho249.
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What is sight reduction worksheet ho249?
The sight reduction worksheet ho249 is a tool used for calculating celestial navigation data to determine a ship's position at sea.
Who is required to file sight reduction worksheet ho249?
Mariners and navigators who practice celestial navigation are required to file sight reduction worksheet ho249.
How to fill out sight reduction worksheet ho249?
To fill out the sight reduction worksheet ho249, you must enter the necessary celestial navigation data such as sextant readings, time, and star information.
What is the purpose of sight reduction worksheet ho249?
The purpose of sight reduction worksheet ho249 is to accurately determine a ship's position based on celestial observations.
What information must be reported on sight reduction worksheet ho249?
The information reported on sight reduction worksheet ho249 includes observed sextant readings, time of observation, celestial body data, and calculated position.
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