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
    LOP's
    From: Barry Hudson
    Date: 1999 Jun 23, 18:13 EDT

    >Date: Wed, 23 Jun 1999 09:12:43 -0700
    >To: Navnet
    >From: bhudson <bhudson{at}XXX.XXX>
    >Subject: LOP's
    >
    >Hi,
    >All LOP's of a celestial nature need an arrow at each end. This is
    >perhaps not so important with say a single sun observation but when
    >it comes down to a multi star/planet set of observations (as many as
    >six or maybe more) you need to distinguish the azimuth lines from
    >the Position lines by placing the arrows.What a clutter we have if we
    >dont do this. Electronically of course only the PL's appear on the LCD so
    >it does'nt matter about the arrows. Someone already mentioned that
    >the celestial PL is an arc of a circle and harking back to coastal nav
    >when taking a sextant or radar distance off it is part of a circle of
    >position so we put an arrow at each end of that arc of the circle we
    >are most likely to be on. In coastal navigation we also have other
    >arrow symbols to identify lines on the chart and prevent confusion e.g.
    >is it a course line, bearing, tide or current drift,and so on. It is
    >also important to bear in mind how many people are involved in the
    >navigation of the vessel.For instance take a large commercial vessel
    >with many users of the same chart one has to be particular with symbols
    >used they must be readily understandable to all. In the case of a
    >single navigator then he can do what he wants as long as the PL's make
    >sense to him.
    >Myself if I did'nt use arrows to distinguish between azimuth and PL
    >confusion would rain supreme.
    >This is a most stimulating network.
    >Barrie Hudson
    >
    

       
    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