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: Celestial Pre-computation Form for Polhemus
    From: Gary LaPook
    Date: 2016 Nov 23, 23:20 -0800

    I am attaching several photos of my Polhemus showing some additional markings I placed on it. 

    One can calculated the coriolis corrctions for each individual sight instead of moving the AP or the final fix. On the front of the Polhemus I placed a "C+" mark on the left edge and a "C-" mark on the right edge which shows the sign of the coriolis correction in the northern hemisphere, any body to the left of the track requires adding the coriolis correction the Hp and must be subtracted if the body is on the right. 

    On the plotting side I placed a "C ^" at the 90 degree left  and is used for moving the AP or fix when using that method for making the coriolis correction. Simply turn the overlay until the track is at the 90 degree left point and then move the fix up the number of miles for the correction. 

    At the bottom on the plotting side I placed a "S" index for use in the southern hemisphere, use it for azimuths.

    Near the center I placed two scales, a horizontal scale to the left corresponding to the latitude of the plane and the vertical scale for the ground speed of the plane. These scales can be used as an alternative way to account for the MOB and MOO adjustments without using the face of the polhemus.

    gl



    File:



    File:



    File:



    File:



    File:



       
    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