Welcome to the NavList Message Boards.

NavList:

A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding

Compose Your Message

Message:αβγ
Message:abc
Add Images & Files
    or...
       
    Reply
    Re: Talk for surveyors about celestial navigation
    From: Greg Rudzinski
    Date: 2017 Jan 14, 05:45 -0800

    Morgan,

    There are quite a few ways to do sight reduction (Bowditch lists over 30). You might want to select a sight reduction table to compare to pocket calculator sight reduction. The most popular tabular method is probably Pub 249. Tabular methods generally require selection of an assumed position to get a whole degree of local hour angle (LHA) thus have longer plotted intercepts. A calculator reduction can use any position as an assumed position with the dead reckoning (DR) position being the most used reference position with the benefit of a shorter intercept.  Be sure to discuss the systematic error benefit of the three body star fix with LOPs seperated by 120°of azimuth vs. a two body fix. Another important discussion point would be the difference between marine/aviation and land celestial navigation.

    Greg Rudzinski

       
    Reply
    Browse Files

    Drop Files

    NavList

    What is NavList?

    Join NavList

    Name:
    (please, no nicknames or handles)
    Email:
    Do you want to receive all group messages by email?
    Yes No

    You can also join by posting. Your first on-topic post automatically makes you a member.

    Posting Code

    Enter the email address associated with your NavList messages. Your posting code will be emailed to you immediately.
    Email:

    Email Settings

    Posting Code:

    Custom Index

    Subject:
    Author:
    Start date: (yyyymm dd)
    End date: (yyyymm dd)

    Visit this site
    Visit this site
    Visit this site
    Visit this site
    Visit this site
    Visit this site