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: What is the best accuracy you can expect from a 'dip-short'table
    From: Jeremy C
    Date: 2014 Oct 22, 09:41 -0700

    I've used it when ships are under the star I want to shoot (typically when relative speed is very small). I have also used it along non-discript land where a range can be obtained, but not a clear bearing.  I have also used dipshort when I am shooting a particular body and it passes over land (e.g. transit of a body).  Fog in convoy is a great idea that I had never considered before.  Of course all of my sights are "nice to do" things.  

    That being said, range is best determined by radar which is what I do.  You could also use a rangefinder, but those are pretty rare on ships that will over the required range.  If the obstruction is of known height, you could also use the sextant to determine height of an object and thereby determine range.  I have also heard of using sound signals and timing the echo, but I've never done it myself.

    If I get the range correct, I find that the tables in bowditch give me no more appreciable error than I would expect if I was using a sea horizon. That has been my experience.  However, most people wouldn't bother to shoot stars if there was an obstruction.

    JCA

       
    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