Welcome to the NavList Message Boards.


A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding

Compose Your Message

Add Images & Files
    Re: Homemade plotting sheets
    From: John D. Howard
    Date: 2019 Dec 20, 16:56 -0800


    Thank you - Thank you !

    You have explained something that has confused me for over 40 years:  Why anyone would mess with the longitude scale when the latitude is one minute equal one mile.  I have never used the look-up tables HO 229 nor HO 249 although I knew how they worked.  The requirement that the LHA be a whole degree means your AP longitude will most likely be an odd number of minutes.  DUH !

    My flying was from the 1960s untill I retired in 2009 and (almost) always used Lambert conical charts where the minutes of latitude were always the same and the minutes of longtitude got smaller as you went north ( south ).  When I started playing with cel-nav the plotting sheets were the same.  When I would read instructions on making home-brew plotting sheets, most were the same - latitude scale constant, but some would say mark the bottom in equal divisions and then adjust the latitude minutes.  Now I can make sence of why.

    John H.

    Browse Files

    Drop Files


    What is NavList?

    Join NavList

    (please, no nicknames or handles)
    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 Settings

    Posting Code:

    Custom Index

    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