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: Gnomonic Charts - Usable Zones
    From: Robin Stuart
    Date: 2018 Jan 19, 08:06 -0800

    Bob,

           In Bowditch 2002 you can find this under 2406. Great Circle Sailing by Computation.

    The necessary formulas can be found by applying the cosine and sine rules to Figure 2406. Starting at a latitude, longitude L0, λ0 and traveling a distance D(°) on a course C° measured East from North the necessary formulas are:

    sin L = sin L0  cos D + cos L0 sin D cos C

    sin ( λ - λ0 ) = sin D sin C / cos L0

    An alternative method can be found in section 3 here.

    Regards,

    Robin Stuart

       
    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