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
    Name or NavList Code:
    Email:
       
    Reply
    Re: Scale a small area plotting sheet?
    From: Ed Popko
    Date: 2016 Mar 6, 04:52 -0800

    Ron,

    As you noted, this PostScript program can only center the plotting sheet on whole degrees of latitude or longitude. To center the plotting sheet on any degree/minute latitude or longitude would be quite useful but to do so would entail a substantial rewrite. Perhaps I should have though about this when Jim Morrision and I were playing with this.

    I do have another version of this program that adds one small feature - a way to precisely locate a graphic (a dot perhaps) and a label to the chart. That position can be whole or fractional degrees. Since I take sights from my back yard with the aid of an artificial horizon thus I have located it's known position (KP) which is 42deg 1.281667 min latitude and 74 deg 6.637167 min longitude. In the example plot below, the MAV dot marks the KP.  If this small addition is useful, I'll send the PostScript program. If you look this point up in Google Earth, you will see that Woodstock, New York isn't exactly a deep water port (ha ha).

    On the subject of diagrams, I have another simple PostScript program that creates meridian diagrams.  You are welcome to have it as well. In round numbers, I'm near 75 deg West. The rim scales show longitude, Greenwich reference and local hour angle. No great shakes, but convenient if you are graphically playing with time conversions etc.

    I will give some thought to the small area polt sheet code rewrite but it's not something I can tend to immediately.

    Ed

       
    Reply
    Browse Files

    Drop Files

    NavList

    What is NavList?

    NavList is a community devoted to the preservation and practice of celestial navigation and other methods of traditional position-finding. We're a group of navigators, navigation enthusiasts and hobbyists, mathematicians and physicists, and historians interested in all aspects of navigation but primarily those techniques which are non-electronic.

    To post a message, if you are already signed up as a NavList member, start a new discussion or reply to any posted message and use your posting code (this is a simple low-security password assigned when you join). You may also join by posting. Your first on-topic messsage automatically makes you a member, and a posting code will be assigned and emailed to you for future posts.

    Uniquely, the NavList message boards also permit full interaction entirely by email. You can optionally receive individual posts or daily digests by email, and any member can post messages by email (bypassing the web site) by sending to our posting address which is "NavList@NavList.net". This functionality is similar to a traditional Internet mailing list: post by email, read by email, reply by email. Most members will prefer the web interface here for posting and replying to messages.

    NavList is more than an online community... more about that another day.

    © Copyright notice: please note that the rights to all messages and posts in this discussion group are held by their respective authors. No messages or text or images extracted from messages may be reproduced without the explicit consent of the message author. Email me, Frank Reed, if you have any questions.

    Join / Get NavList ID Code

    Name:
    (please, no nicknames or handles)
    Email:
    Do you want to receive all group messages by email?
    Yes No

    A NavList ID Code guarantees your identity in NavList posts and allows faster posting of messages.

    Retrieve a NavList ID Code

    Enter the email address associated with your NavList messages. Your NavList code will be emailed to you immediately.
    Email:

    Email Settings

    NavList ID 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