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: Great Circle Initial Course Boston to Wellington?
    From: David Pike
    Date: 2017 Dec 3, 06:21 -0800

    If in doubt, use a tape measure.  Distance around equator of globe 880mm.  Distance Boston to Wellington 316mm.  Great circle distance Boston to Wellington 316x21600/880=7756nm which is about 98% of the correct value.  By inspection, the initial bearing is about 250 (although it looks more like the correct value in the photograph below).  A proper floating ball could be swivelled to give some surprisingly close values as it undoubtedly was in the past.  DaveP



    Attached File:



    Attached File:



    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