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: Calculate new coordinates given bearing and distance?
    From: Lars Bergman
    Date: 2021 Nov 4, 14:43 -0700

    Tony,
    Those formulas are for great circle sailing, where you ideally constantly change your course, in practice change the course at certain time or distance intervals. If you are keeping a fixed course you practice rhumb line sailing and then another set of formulas are used. For short and medium range distances they typically look like

    Lat2 = Lat1 + Dist · cos(Course)

    Long2 = Long1 + Dist · sin(Course) / cos((Lat1 + Lat2) / 2)

    In other words you use plane trigonometry but have to take care of the fact that the meridians converge towards the poles so the longitude difference is a function of your latitude.

    These different sailings are covered in any text book on navigation. For the daily dead reckoning job onboard ships Traverse Tables were used (prior to electronic calculators). Those tables are (or were at least) included in all Nautical Tables.

    Lars

       
    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