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Sight Reduction Form (HO 249 and NAO) 1. Sight # DR Position DR L (N/S) DR Lo (W/E) 2. Time Celestial Body Local Date WT: H M S ZD (E/W+) H GMT WT H M S WE (F/S+) ( ) M S GMT: H M S GMT Date 3a. Almanac.

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How to fill out the Sight Reduction Form online

Completing the Sight Reduction Form online is essential for accurate navigational calculations. This guide provides clear instructions for each section of the form, ensuring users can effectively submit their information.

Follow the steps to accurately complete the Sight Reduction Form online.

  1. Click ‘Get Form’ button to obtain the form and open it in the editor.
  2. Fill in the 'Sight #' field with the sequential number of your sighting. Then, enter the DR Position, specifying both the Latitude (N/S) and Longitude (E/W) in degrees, minutes, and seconds.
  3. Complete the Time section by specifying the Celestial Body observed, the local date, and the time in hours, minutes, and seconds. Record the appropriate Zone Description (East or West), and convert the local time to GMT.
  4. In Section 3a, enter the Almanac LHA and SHA values along with the GHA. Make sure to include the appropriate corrections for planets or the moon and calculate the Total GHA and LHA.
  5. Proceed to Section 3b for the Almanac Declination. Record the time and the declination value, along with any necessary corrections.
  6. Using the information calculated from HO 249, fill out the Latitude and Declination information. Follow the instructions to find the corresponding values from the NAO tables.
  7. Complete the Sextant section by entering the observed altitude (Hs) and necessary corrections for instrument errors and the height of the eye.
  8. Finalize the plotting phase by calculating the values for Hc or Ho, ensuring to indicate the correct plotting direction based on your sighting details.
  9. Once all sections are completed, review all entries for accuracy. Users can then save changes, download the completed form, or print it for submission.

Start completing the Sight Reduction Form online now for precise navigation accuracy!

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In astronavigation, sight reduction is the process of deriving from a sight, (in celestial navigation usually obtained using a sextant), the information needed for establishing a line of position, generally by intercept method.

Sight Reduction Tables are used in celestial navigation to "reduce" (analyze) the "sights" (data obtained from a sextant at known times) in order to find your latitude and longitude.

The HO229 tables are more accurate by one decimal place, due to the data in the HO249 tables are rounded to the whole degree. In addition, the HO249 are limited to declinations up to 29° (volumes 2 and 3) and 80° (volume 1). The HO229, on the other hand, does not have this restriction.

Step-by-step sight reduction Start with Hs, the angle that you read off of your sextant. Apply the index correction. Correct for height of eye using the dip table on the inside front cover of the Nautical Almanac. ... Determine and apply the main sun correction from the inside front cover of the Nautical Almanac.

They are designed to facilitate the practice of celestial navigation at sea. The tables are primarily used with the intercept method of sight reduction by entering arguments of latitude, declination and local hour angle and obtaining tabulated altitudes and azimuth angles.

The Intercept (Marcq Saint-Hilaire) Method The Marcq Saint-Hilaire or intercept method is the most popular way to reduce a sight for a line of position.

Your observed measurements with the sextant, combined with data from these tables allow you to obtain the necessary coordinates to plot a Line of Position with some simple addition and subtraction. This process, called a sight reduction, is guided by the Sight Reduction Form.

The Nautical Almanac Sight Reduction Method. The NASR method uses concise sight reduction tables that are included as part of the Nautical Almanac. Hence, an advantage of the NASR method is that it enables sights to be reduced using a tabular method with only one volume.

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© Copyright 1997-2025
airSlate Legal Forms, Inc.
3720 Flowood Dr, Flowood, Mississippi 39232
Form Packages
Adoption
Bankruptcy
Contractors
Divorce
Home Sales
Employment
Identity Theft
Incorporation
Landlord Tenant
Living Trust
Name Change
Personal Planning
Small Business
Wills & Estates
Packages A-Z
Form Categories
Affidavits
Bankruptcy
Bill of Sale
Corporate - LLC
Divorce
Employment
Identity Theft
Internet Technology
Landlord Tenant
Living Wills
Name Change
Power of Attorney
Real Estate
Small Estates
Wills
All Forms
Forms A-Z
Form Library
Customer Service
Terms of Service
Privacy Notice
Legal Hub
Content Takedown Policy
Bug Bounty Program
About Us
Blog
Affiliates
Contact Us
Delete My Account
Site Map
Industries
Forms in Spanish
Localized Forms
State-specific Forms
Forms Kit
Legal Guides
Real Estate Handbook
All Guides
Prepared for You
Notarize
Incorporation services
Our Customers
For Consumers
For Small Business
For Attorneys
Our Sites
US Legal Forms
USLegal
FormsPass
pdfFiller
signNow
airSlate WorkFlow
DocHub
Instapage
Social Media
Call us now toll free:
+1 833 426 79 33
As seen in:
  • USA Today logo picture
  • CBC News logo picture
  • LA Times logo picture
  • The Washington Post logo picture
  • AP logo picture
  • Forbes logo picture
© Copyright 1997-2025
airSlate Legal Forms, Inc.
3720 Flowood Dr, Flowood, Mississippi 39232