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: Watches as chronometers
    From: Gary LaPook
    Date: 2015 Sep 24, 01:18 -0700

    A further update of my experiment. I started checking three cheap watches on october 7, 2009, al;most six years ago. I have not yet had to replace any of the watch batteries. Comparing the actual errors in each of the watches compared with the predicted errors shows that watch A is 75 seconds faster then precicted, watch B is 22 secoonds slow and watch C is 31 seconds slow. If using just the one watch with the worst error, 75 seconds, then  a longitude computed by that would be in error by 19 minutes on longitude. If you use the average of all three, 22 seconds fast, you end up with a longitude error of 5.5 minutes of longitude. All this after six years using three $17 watches without any update from a radio time signal.

    See prior reports: 

    http://fer3.com/arc/m2.aspx/Watches-chronometers-LaPook-mar-2011-g16014

    http://fer3.com/arc/m2.aspx/Watches-chronometers-LaPook-may-2013-g24211

    gl

       
    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