Welcome to the NavList Message Boards.

NavList:

A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Position-Finding

Compose Your Message

Message:αβγ
Message:abc
Add Images & Files
    or...
    Re: Solstice Sun Lines
    From: Brian Walton
    Date: 2018 Jan 5, 20:50 -0800

    Tracy,

    We’re talking the same language.  Here are some refinements.

    To reduce “dome correction”  try and get a body where the line of sight crosses the window at 90° near the middle.  The 747 has awful thick curves near the edges, the 767 a nice flat window.

    Definitely do Coriolis corrections.  Groundspeeds go up to 700 kts eastbound.

    The more single shots you do, the easier it is to recognize a good one and discard a bad one.  I used the side of the bubble, not the middle.  Backlash on the gearing might mean it’s better to refine always tracking up, or always down.  I don’t like tracking for 2 minutes;  nasty things creep up behind you.

    Oceanic routes often have legs following a parallel of latitude. Perfect, since Lat won’t change whilst you shoot for Long.  Running fixes aren’t necessary.  I discarded running fixes since my yacht calculator refused to accept ground speeds of hundreds of kts. I was able to fix this with my own programs in a Psion.

    Your accuracy is adequate.  Minimum time taken to get a fix is more important. Keep practicing; as with any artisan skill, you can forget how to do it. Love your PBY story.  I guess the R in CRJ means long trips are rare.  Winter westbound Pacifics are up there with your Catalina!

    Brian Walton

    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