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: Distance Measurement - Tape vs Google
    From: Brad Morris
    Date: 2013 Apr 11, 18:02 -0700

    Hi Bruce

    Gary LaPook wanted a very long baseline with the bubble sextant measured angle to improve the accuracy of his HoE, in his "Dip Meter Again" post. I think that's one of the reasons why he did it that way, using Google earth.

    You can use a lesser distance because of the greater angular precision of your theodolite. Hence the 200' restriction of your tape isn't a restriction! Nicely done.

    The bubble sextant, of course, cannot really compete with a theodolite for angular measure and thus HoE determination at a distance of 200'. Note that a larger population of bubble sextant owners are in the audience than theodolite owners. So for the benefit of those who have one and not the other, using a long baseline helps when determining HoE by bubble sextant.


    NavList message boards and member settings: www.fer3.com/NavList
    Members may optionally receive posts by email.
    To cancel email delivery, send a message to NoMail[at]fer3.com

    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