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: Scale of Intercept
    From: John D. Howard
    Date: 2020 Feb 1, 09:55 -0800

    David,

    You have it wrong.  It is much simpler than that -  the intercept is 1 MOA = 1 NM.  Any direction, and azimuth.

    The intercept is an angle, but an angle along a great circle.  Rember any visual sight is along a great circle.   No matter if the sun is West or the star is North-East, the angle measured is one minute of arc = one nautical mile.

    You use the intercept to draw the line of position.  You do not need to figure any dLong because you can be at any longitude along the LOP.  You draw the LOP so many miles from your AP perpendicular to the azimuth.  The only time you need to figure lat and long is when you get a fix.  The fix is a point that has a lat and long but that point is also so many NM from where you are standing.  When people say they got a fix so many miles from their GPS position they are measuring point to point, not an intercept.

    Hope I have not added to your confusion.

    John H.  41N  100W

       
    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