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
    Cannot dispense with the assumed position at sea
    From: Gary Harkins
    Date: 2004 Feb 18, 19:00 EST
    In a message dated 2/18/2004 12:20:32 PM Eastern Standard Time, jim2@jimthompson.net writes:
    Can we plot a celestial sight if we do not have a nearby "assumed position"?
    Yes!...3 CLOP's will have a common intersection at only one place on the face of the earth.  You can plot these using the GP's of the bodies as the center of the COP and the co-altitude as the radius of the COP.  An example of this is a problem used in one of the books I have.  It says that you are somewhere on earth and you take these 3 sights and gives the data (date, time, Hs etc....).  It then asks "where are you?"  At first glance many people think that this is an impossible problem.  However, the plots are possible, although a little cumbersome, because of the typical radius' involved.
    Gary Harkins C400 #140 "Cygnus"
    Website   http://www.hometown.aol.com/htycgary/myhomepage/index.html
    Harbour Towne Marina, Muskegon, Michigan Slip C-28
    Harbour Towne Yacht Club, Life Member
    C400 National Association
    United States Power Squadrons-JN

    NRA Life Member
    MCRGO (Michigan Coalition for Responsible Gun Owners)
    JPFO (Jews for the Preservation of Firearms Ownership)
    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