Welcome to the NavList Message Boards.


A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding

Compose Your Message

Add Images & Files
    Re: Medieval Navigation Problem
    From: David Pike
    Date: 2019 Nov 27, 02:17 -0800

    Frank: Reference your triangles drawing, I did something very similar (no pun intended) in my original investigations.  I didn’t report it, because I didn’t know which symbols Navlist would accept, and I didn’t want to start adding photos when the cute solution of a flip, a straight line, and a 345 was so pretty.  

    I called the distance from the barn to the river a.  Then total distance = sqrt((2a)sqd + (8a/3)sqd) + sqrt(asqd + (4a/3)asqd) = sqrt(4asqd + 64asqd/9) + sqrt(asqd + 16asqd/9) = sqrt(100asqd/9) + sqrt(25asqd/9) = 10a/3 + 5a/3 = 15a/3 = 5a = 5 x 200 = 1000yds.

    I’m not entirely sure experienced walkers would swallow your lens theory, because they all know to avoid marsh at all cost; stick to the firm ground despite the longer journey.  If crossing a marsh becomes inevitable, cross it at the narrowest possible point, probably at right angles, which rather defies any laws of refraction, but then it was only an example. DaveP

    Browse Files

    Drop Files


    What is NavList?

    Join NavList

    (please, no nicknames or handles)
    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 Settings

    Posting Code:

    Custom Index

    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