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
    Name or NavList Code:
    Email:
       
    Reply
    Re: wristwatch chronometers
    From: Alexandre Eremenko
    Date: 2012 Apr 18, 19:33 -0400

    Of course it is unfair to compare mechanical watches
    with quartz ones. And certainly many cheap quartz watches
    will outperform any chronometer.
    I have a quartz watch ($200, which is not exactly cheap for a quartz
    watch) which will be off 2-3 seconds PER YEAR without any adjustment.
    So mechanical watches should be ony compred with mechanical watches.
    
    Now, the table you refer to gives the accuracy criteria which
    may be reasonable for for a wristwatch, but not reasnable
    for a chronometer.
    
    For example, they say that a typical modern mechanical watch which is
    "certified as a chronometer" must have a rate +/- 3 sec/day.
    This is a meaningless number for a chronometer.
    Good marine chronometer is not a watch whose rate is small
    but a watch whose rate is CONSTANT.
    Think of a chronometer which will have +3 sec rate for 10 days
    and -3 sec rate for some other 10 days.
    Is this chronometer useful for determination of longitide?
    Not much.
    
    The difference between a "good wrist watch" and a chronometer is
    very visible when I compare my chronometer to a good wristwatch for a
    month or so.
    
    Alex.
    
    
    
    
    

       
    Reply
    Browse Files

    Drop Files

    NavList

    What is NavList?

    Get a NavList ID Code

    Name:
    (please, no nicknames or handles)
    Email:
    Do you want to receive all group messages by email?
    Yes No

    A NavList ID Code guarantees your identity in NavList posts and allows faster posting of messages.

    Retrieve a NavList ID Code

    Enter the email address associated with your NavList messages. Your NavList code will be emailed to you immediately.
    Email:

    Email Settings

    NavList ID 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