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: Harbor Markers
    From: Brad Morris
    Date: 2018 Nov 25, 11:26 -0500
    Hi John

    You are absolutely correct.  The better ways to check your chronometer are all today's ways!

    The period when this method would be popular would be after chronometers became prevalent and before technology provided a better answer.  Like the telegraph!

    Worsley used this method on Elephant Island because there was no alternative.  No internet, no GPS, no WWV radio, no passing ships, no telegraph, etc.  The uncertainty of location of Cape Belsham on Elephant Island led to uncertainty in the rating of the chronometer.  Which brings us full swing back to Eamonn's question.

    Eamonn's question was about "harbor markers".  There are a few references to them in books.  Apparently, they were used to provide the exact known location for this observation.  He wanted to know about them and if any still exist.  We on NavList often head right into the weeds and miss answering the question.  Let's at least try!

    A harbor marker almost sounds like a surveyor's monument, as it is land based with a precision definition of location. Similar to a geodetic monument, or perhaps even the same thing.  

    I consulted the 18th edition of Wrinkles in Practical Navigation, Lecky, published in 1919, to see what he had to say about "harbor markers".  In the topic "Principle of getting the correct G.M.T. by observation on shore", Lecky describes the exact process of the observation, mentions a few fixed locations on the Suez Canal, but does not mention the phrase harbor marker. Lecky does speak to the known geographic location, but does not use the phrase harbor marker.  Odd that he would ignore the phrase if it were in the navigator's common parlance, in consideration of the vast breadth of Lecky.  That would be odd except if it wasn't actually in use!  If not in use, then why would Lecky mention it?  

    Brad









    On Sat, Nov 24, 2018, 11:49 PM John D. Howard <NoReply_Howard@fer3.com wrote:

    Brad,

    Do you mean better ways now or back before radio, internet and cell phones?   In the 18 th C. and 19 th C. I cannot think of a better or more accurate way to check time.  Maby the time ball drop at noon or firing a cannon but for a random time check the reverse " time sight " seems the best way.

    John H.

    View and reply to this message

       
    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