Welcome to the NavList Message Boards.


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

Compose Your Message

Add Images & Files
    Newbie Question - Parallel LOPs
    From: Mark Waters
    Date: 2009 Jan 28, 00:08 -0800

    I've recently taught myself Celestial Navigation from library books
    but I still have some newbie questions. I thought I was doing fairly
    well using an artificial horizon - accuracy to within 6NM last week -
    but today after taking sun sights at 10.00 and 14.00 all my LOPs ran
    parallel. I reduced 8 different sights and double checked everything
    but the same result. I had read that a 4 hour spread would be enough
    but today my LHAs and Zn's all came out similar. My DR Long is 121W. I
    can only deduce that taking sights of the sun at a similar altitude at
    10.00 and 14.00 caused the LHA to be too close despite 4 hours time
    difference? Is this correct and will this always occur taking sights
    at this time if not moving? Excuse the naivety but like I said I am
    still a beginner.
    Many thanks,
    Navigation List archive: www.fer3.com/arc
    To post, email NavList@fer3.com
    To unsubscribe, email NavList-unsubscribe@fer3.com

    Browse Files

    Drop Files


    What is NavList?

    Join NavList

    (please, no nicknames or handles)
    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 Settings

    Posting Code:

    Custom Index

    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