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: USCG Sample Problem #2 for Southern Hemisphere
    From: Greg Rudzinski
    Date: 2013 Apr 19, 08:28 -0700

    And G'day to you Kermit,

    Yes this mythical adventure must go on in search of a southern circumpolar star. Before this can be done someone will have to collect the USCG cadets strewn all about Bora Bora. This task will require drawing lots naturally ;-) For the next destination will be the land of Oz. Brisbane to be exact. It is said that an infinite amount of beer and cheer resides there :) A great circle course is laid down and at latitude 25* S and longitude 179* E a morning twilight round is made on 1 October 2013 between 0500 and 0512 zone time (1700 UT 9/30/13).

    OK Kermit now you get to pick a star ;-) G

    P.S. I will be wagering on Acrux although it is a bit low in the sky.

    Re: USCG Sample Problem #2 for Southern Hemisphere
    From: Antoine Couëtte
    Date: 2013 Apr 19, 04:49 -0700
    RE : http://fer3.com/arc/m2.aspx/USCG-Sample-Problem-2-for-Southern-Hemisphere-Rudzinski-apr-2013-g23605

    Good Day Greg,

    You should be soon waking up ... therefore you need some reading ! :-)

    At 10:00 LT, i.e. 20:00 UT, I find the following position :

    S 09°41'8 W 152°43'7 with a LOP's dispersion of 0.1 NM (Excellent !)

    This result - subject to crosscheck with Peter Hakel (see " http://fer3.com/arc/m2.aspx/Group-Project-USCG-student-sample-problems-Couëtte-apr-2013-g23607 " ) - seems within 1 NM from your result.

    Best Regards


    PS : May I suggest that there should be one example with a Southern Declination CIRCUMPOLAR Star with a Local Time somewhere between 180° and 270° ? As I can recall from previous practice (many many moons ago) the heights interpolations from the HO tables require extra care under such situations. This would involve building up one other example ... if you think this idea is OK, I can build it up.

    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

    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