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    Re: DR plotting techniques
    From: Stacy Hanna
    Date: 2003 Oct 17, 14:19 -0400

    Actually getting the corrections off of the web is easier than ever. For
    US notice to mariners the website is
    http://pollux.nss.nima.mil/index/index.html and for British Admiralty
    notices use  http://www.nmwebsearch.com/ . The US website is currently
    down while they work on it but will probably be back up later this
    afternoon. Both websites let you search for corrections by chartnumber
    so you only have
    to pull up the ones you actually need.
    -----Original Message-----
    From: Navigation Mailing List
    [mailto:NAVIGATION-L{at}LISTSERV.WEBKAHUNA.COM] On Behalf Of Rodney
    Sent: Friday, October 17, 2003 14:46
    Subject: Re: DR plotting techniques
    I did not discuss this point, but perhaps should have. From about 1984
    to the mid 1990s, we faithfully updated charts from printouts generated
    by the Automated Notice to Mariners system of the US Hydrographic
    Office. This was relatively easy because it was a text-based
    direct-dial modem (or SSB for those at sea) and I could write a script
    that I could start with a keystroke and ignore while it took down
    corrections sorted by chart number.
    Before that we used the paper Local Notices. These were not as
    convenient, because each correction was printed once, with a list of
    chart numbers following.
    SInce the world-wide web became universal, just getting the updates is
    a manual hassle. I have been much sloppier. We have gotten away with
    this because of the GPS, which lets us identify renumbered ATONs by
    If anyone knows a way to automate the current system, I hope s/he will
    post it.
    Rodney Myrvaagnes J36   Opinionated old geezer
    Eagles may soar, but weasels don't get sucked into jet engines.

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