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
    Beach CN Practice in a Near Gale
    From: Greg Rudzinski
    Date: 2011 May 24, 11:43 -0700

    Yesterday was very windy here in Southern California and has been all month it seems and I decided to try some CN observations of the Sun at the beach with the wind blowing about 30kts. using a sight tube and a graph of pre-calculated altitudes (Hp). Timing was done using splits on a stop watch which allowed for 10 observations in 10 minutes without rushing the shots. Determining the intercepts was done on the spot taking less than 5 minutes including the average intercept. All the results were within plus or minus 1 minute of arc (most acceptable considering the windy conditions). On my up coming sea trial on a small craft I am anticipating plus or minus 2 minutes of arc (not in 30 kts. of wind though).

    I don't recommend anyone try using their sextant at the beach in wind over 20 kts. When wind gets above 20 kts. at the beach sand starts to lift getting into everything. It required blowing, brushing and rinsing to get the sextant free of sand when I got back to my boat dock. Sand will crunch horribly when it gets between the micrometer drum and arc. This in fact cut short my beach observation trial. If you do decide to practice in messy conditions I suggest using an already abused sextant. I happen to have a beat up sextant so no worries (Mid 80's Cassens & Plath). I was surprised that the index error held constant and checked out to the same number after a full wash down and cleaning.

    Greg Rudzinski
    ----------------------------------------------------------------
    NavList message boards and member settings: www.fer3.com/NavList
    Members may optionally receive posts by email.
    To cancel email delivery, send a message to NoMail[at]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