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: Radar Plotting Sheet for Polaris
    From: Gary LaPook
    Date: 2009 Oct 19, 02:51 +0200
    You can also place a mark representing the location of Polaris on an E-6B, a Mk 6a plotting board or on a Pohemus computer to calculate the correction for Polaris. Place the dot on the rotating disk in such a position so you can set it to LHA Aries instead of LHA Polaris, saves a little bit of work,


    http://www.fer3.com/arc/m2.aspx?i=108473&y=200905

    http://www.fer3.com/arc/m2.aspx?i=109875&y=200909

    http://www.fer3.com/arc/m2.aspx?i=105846

    After plotting the position of Polaris merely turn the disk to the LHA Aries and read the correction from the vertical scale. This is not a new idea it is only a modern "nocturnal."

    You can also add a scale on the HO 2102-D to accomplish the same thing.

    http://www.fer3.com/arc/imgx/IMG_0148.JPG

    the purple scale along the edge.Set in LHA Aries and read out the correction.

    http://www.fer3.com/arc/m2.aspx?i=107982&y=200904

    You need to replot Polaris every year or so or you can use the epoch 2010 position from H.O. 249 for a long period as long as you apply the "precession and nutation" correction to the Polaris LOP. Of course you can just use the "Q" correction table from the Air Almanac or from H.O. 249 remembering the "P&N" correction if using the H.O. 249 "Q" table."

    gl

    gl










    Greg Rudzinski wrote:
    A radar plotting sheet can be used for correcting a Polaris HO to get Latitude. 90° minus Polaris declination will give the diameter of the circle in minutes of arc. The attached example is 90° - 89° 18.4' for a 41.6' plotting sheet circle diameter. Intersect the circle with the LHA of Polaris then measure to the baseline with dividers. The scale at the upper left will provide the correction to better than a minute of arc.
    
    
          
    --~--~---------~--~----~------------~-------~--~----~
    NavList message boards: www.fer3.com/arc
    Or post by email to: NavList@fer3.com
    To unsubscribe, email NavList+unsubscribe@fer3.com
    -~----------~----~----~----~------~----~------~--~---
    
      




       
    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