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: Position lines, crossing
    From: Dave Walden
    Date: 2006 Dec 11, 17:31 -0800

    Doing a quick monte-carlo, taking a postion, assuming errors are
    normally distritubted with a stanard deviation of 0.5 min, and lines
    120 deg apart, I find 250,562 of 1,000,000 inside the 'cocked hat'.
    Not surprising.   The average distance from the fix to the true
    position, using the Nautical Almanac method, is 0.51 miles.  The
    standard deviation  is 0.27.  So, things aren't quite so bad.  (The
    results scale so if the SD error in altude is 5 min, the postion error
    average is 5.1 miles.)  Will try to track 'hat size' as Frank suggests
    next.
    
    
    --~--~---------~--~----~------------~-------~--~----~
    To post to this group, send email to NavList@fer3.com
    To unsubscribe, send email to 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