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
    How much resolution is enough?
    From: Greg B
    Date: 2014 Dec 17, 12:24 -0500

    Hi All,
          A couple of quick (?) questions raised by the the recent discussions
    about the compact Haversine table and the Brown-Nassau Spherical
    computer. I sail a Catalina 28 MK2 ( mid 1990's) so I am used to bobbing
    about when underway. I must say up front that all of my celestial sights
    are for fun - as I basically sail in Long Island Sound. Still it is a
    skill worth
    knowing to me. On land I can get a sight down to 0.1 or 0.2 NM I have
    heard others say +/- 5NM would be good on the water - but on what size
    vessel? Also if I take multiple sights, only at say, at the crest of a
    wave -
    - do I figure wave height into my eye height error? Seems like the math
    really doesn't have to be any more accurate than the error inherent in the
    sight.(?). I must also say up front that I love period navigation but my
    little
    Cat 28 + my skill level ='s no ocean going boat. So doing it on the sound is
    going to have to do. But I have used my sextant for determining range
    with good results (+/- 0.1 NM) while doing coastal i.e; DR +Pilotage, and
    since I'm also a history buff (Huntington Militia) - I made a lead line
    and log
    line - good fun!
    Many thanks in advance,
    ~ Greg
         Svenska Flicka
         Cat. 28 MK2
    
    

       
    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