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: Ellipse of Confidence in position finding
    From: Robin Stuart
    Date: 2019 Mar 18, 09:17 -0700

    Bill,

         The 20NM limit in the NA is probably a general rule of thumb and assumes that the observer typically avoids taking sights when the object's altitude is very high and hence the GP is quite close.

          I'm not sure whether this directly answers your question about published guidelines but the only other place that I recall seeing LoP curvature adjustments is in Pub 229 Section C.1 Adjustment of Straight Line of Position.

    Regards,

    Robin

       
    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