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: Error to Printed HO 249 Volume 2
    From: S C Sullivan
    Date: 2008 Oct 21, 12:50 -0500
    Here's the response that I received from  the NGA:

    Steve Sullivan,

    Thank you for submitting a request to the NGA Maritime Customer Database. The question/comment originally submitted is listed below along with a resolution.

    Date Submitted:10/21/2008

    Subject Matter: Nautical Publications

    Question/Comment:
          Has anyone reported an error to the printed HO 249 Volume 2; page 158, LAT 26, Declination (0 - 14), Contrary? This page appears to be a reprint of page 152, LAT 25, Declination (0 - 14), Contrary. Credit for this goes to an engineering professor at the University of Tennessee in Memphis. Steve Sullivan

    Resolution:
          Thank you for bringing this error to our attention. In reference to HO 249 Vol.2, page 158, LAT 26, Declination (0-14), Contrary: the data on page 158 was incorrectly generated by the software used to create the online version of this publication, available on the NGA Maritime Safety Web site. The data on page 158 in the spiral-bound printed hardcopy of HO 249, Vol.2, is correct. We are working to resolve this problem with the online version.

    NGA Maritime Customer Database
    MCDPubs@nga.mil



    On Tue, Oct 21, 2008 at 1:54 AM, Gary LaPook <glapook@pacbell.net> wrote:
    Gary LaPook writes:

    Although the page numbering is the same in my 1970 edition of H.O 249 mine does not contain the error that you identified. I checked the online version of H.O. 249 at:  http://www.nga.mil/portal/site/maritime/?epi_menuItemID=8755b5dbee96c4327b2a7fbd3227a759&epi_menuID=35ad5b8aabcefa1a0fc133443927a759&epi_baseMenuID=e106a3b5e50edce1fec24fd73927a759

    and found the same error on those two pages.

    Last November 28th I posted the messages below and it now appears that they have corrected on the online edition the errors I had pointed out to them at that time. The contact information in that exchange might be useful in bringing this new error to their attention.

    gl

    "I recently posted a link to the government web site where you can
    download copies of navigational publications including H.O 249. I
    quote below the email I sent to that site:

    "Dear Sir:

    "Quite by chance I noticed an error in the on line edition of HO 249
    volume 2. I then looked for similar errors and found that there is a
    systematic error in both volumes two and three. For example, on page 5
    of volume 2 covering latitude 0º in the first column covering
    declination of 15º at LHA 89 the altitude given is 00-58'; for LHA 90
    the altitude is given as 00-00'; and for LHA 91 the altitude given is
    00-58' which is the same value as given for LHA 89! This is
    mathematically impossible. The problem is that the altitude for LHA 91
    should be negative 00-58'. The systematic error found all across the
    tables up to at least latitude 39º is that  all of the last positive
    altitudes tabulated should all be negative altitudes! This is also
    true for the values given for contrary name declinations. For example
    on page 163 of volume 2 covering latitude 27º in the first column for
    0º declination tabulated for LHA 91 an altitude of 00-53'; for LHA 90
    an altitude of 00-00'; and again at LHA 89 an altitude of  00-53'. The
    altitude for LHA 91 should be negative 00-53'.

    "I compared these examples with my printed copies of these tables
    printed in 1970 and these errors do not appear in the printed version
    which correctly label these altitudes as negative altitudes."

    Sincerely

    Gary LaPook


    Gary LaPook writes:

    I recieved the following email from the government website that had
    published H.O 249 with errors.

    "Mr. LaPook

    Thank you for bringing this error to our attention. It seems that the
    Sight Reduction Table generation code improperly formatted entries
    beginning with -0, inserting 00 instead.

    I am in the process of manually updating the electronic publications,
    which will be posted to our Web site in the very near future.

    The errant publications were originally produced and posted to our Web
    site in 1999. Which mean that, in their 8+ years of service, you are
    the first and only user to notice the error!

    Regards,

    Tim Doherty
    Office of Global Navigation/Technology
    National Geospatial-Intelligence Agency
    (301)227-1075








    Steve Sullivan wrote:
    Thanks for looking, I just bought my copy a few months ago. I think the online version shows the error as well. We noticed it when we were doing sights off of Fort Lauderdale this past weekend.

    Steve

    On Mon, Oct 20, 2008 at 2:04 PM, werner <w.r.l@gmx.net> wrote:

    Not in mine. Different contents in pages 152 and 158. I have the 1978
    edition.

    Werner

    On 20 Okt., 15:49, scsullivan <scsulli...@gmail.com> wrote:
    > Has anyone reported an error to the printed HO 249 Volume 2; page 158,
    > LAT 26, Declination (0 - 14), Contrary? This page appears to be a
    > reprint of page 152, LAT 25, Declination (0 - 14), Contrary. Credit
    > for this goes to an engineering professor at the University of
    > Tennessee in Memphis.
    >
    > Steve Sullivan









    --~--~---------~--~----~------------~-------~--~----~
    Navigation List archive: www.fer3.com/arc
    To post, email NavList@fer3.com
    To , email NavList-@fer3.com
    -~----------~----~----~----~------~----~------~--~---

       
    Reply
    Browse Files

    Drop Files

    NavList

    What is NavList?

    Get a 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