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: The Great Circle Challenge
    From: UNK
    Date: 2014 Dec 27, 20:38 -0000

    In that case, the Bygrave looks accurate as per Doniol, and at 2 minutes, much quicker. But  the very primitive Brown –Nassau prototype, looks incredibly good. I suspect the definitive , final version will be much better. Greg and Hanno’s Doniol remain my favourite long hand method, but as I use it , no contest time wise, with Bygrave  and now more convincely, the newly re-discovered Brown-Nassau. I suspect that will beat anything in the final version.

    Watch this space.

    Francis

     

    From: NavList@fer3.com [mailto:NavList@fer3.com] On Behalf Of Stan K
    Sent: 27 December 2014 13:16
    To: francisupchurch---.com
    Subject: [NavList] Re: The Great Circle Challenge

     

    4069 looks right to me.

    -----Original Message-----
    From: Francis Upchurch <NoReply_Upchurch@fer3.com>
    To: slk1000 <slk1000---.com>
    Sent: Sat, Dec 27, 2014 7:41 am
    Subject: [NavList] Re: The Great Circle Challenge

    Having a bad day. Repeat Bygraves give 4069nm.

    Which  is correct?

    Francis

     

    From: NavList@fer3.com [mailto:NavList@fer3.com] On Behalf Of Francis Upchurch
    Sent: 27 December 2014 12:21
    To: francisupchurch---.com
    Subject: [NavList] Re: The Great Circle Challenge

     

    Apologies I made an error on the Bygrave. Several check repeats now give 4059 nm distance. 25˚55’ course.

    Francis

     

    From: NavList@fer3.com [mailto:NavList@fer3.com] On Behalf Of Francis Upchurch
    Sent: 27 December 2014 09:41
    To: francisupchurch---.com
    Subject: [NavList] Re: The Great Circle Challenge

     

    Merry Xmas Navlist folk.

    The following probably adversely affected by seasonal excesses.

    Bygrave: Course 25˚55’, dist 4063nm. Took 2 minutes. (substitute Dec= arrival lat, LHA (t) = difference longitude.)

    Brown-Nassau prototype: Course 26˚. Dist 4070nm. Took 1min 30 secs approx.

    What is the best ,correct answer?

    Best wishes,

    Francis Upchurch

     

    From: NavList@fer3.com [mailto:NavList@fer3.com] On Behalf Of David Pike
    Sent: 26 December 2014 16:21
    To: francisupchurch---.com
    Subject: [NavList] The Great Circle Challenge

     

     

    The Great Circle Challenge

     

     

     

    Clearly, from recent posts, we all have a favoured way of solving great circle sailings (which we’ll probably never use for real).  Let’s put them to the test by trying something a bit more complicated like a southern to northern hemisphere crossing combined with a crossing of 180degrees E/W.  How about emulating Captain Cook by travelling from Cook Strait (CS), New Zealand to Waimea Bay (WB), Kauai, Hawaii?  Cook followed the pretty route, but we’ll go direct by great circle.  The coordinates are CS 41d 30’S, 174d30’E to WB 21d57’N, 159d 40’W.  Use your favourite method and report back on your answer, the time it took you, and any difficulties encountered.

     

    I’ll stick with the diagram method, because at least I’ll know what I’m trying to prove, and I won’t have as many rules to remember and apply which might or might not work.  Dave

     

    View and reply to this message

       
    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