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    Re: DR plotting techniques
    From: Stacy Hanna
    Date: 2003 Oct 16, 15:03 -0400

    The current practice in the Navy is to plot a gps fix at a minimum of
    thirty minute intervals and DR from that using dividers and rules. Most
    ships also have some type of computer or laptop with navigation software
    hooked into the gps but currently the use of paper charts is still
    mandatory while we work thru the issues of transitioning to the use of
    ECDIS (Electronic Chart Display and Information System) as the primary
    navigation plot.
    -----Original Message-----
    From: Navigation Mailing List
    [mailto:NAVIGATION-L{at}LISTSERV.WEBKAHUNA.COM] On Behalf Of Royer, Doug
    Sent: Thursday, October 16, 2003 14:15
    Subject: DR plotting techniques
    I would like to ask the members of the list who sail or pilot power
    how or what techniques they use to find their DR pos. while underway.I
    only interested in what methods you use and don't wish to get into a
    discussion of accuracy as yet.
    1.Do you use paper charts,rules and dividers?
    2.Do you use mathematical methods such as the following:Lat=Lf + -
    e[S/60(cos T*)] ; Lon.=Lon.f + - e[S/60(sin T*/cos Lf)]
    3.Do you use chatplotters and gps?
    4.Do you use a computer or laptop with navigation software and gps?
    5.Do you use gps only?
    6.Any other method not listed above or a combination of the above.
    Steven,thanks for telling me your training.In future conversations I now
    have a baseline and know how to frame my questions or discussions with
    you.By the way,thanks for the work you did on the Lunar files.I hope to
    some use of them.
    Jared and Dave,I'll get the brand name of the LED nav. lights when I get
    the yard this week to work on the skiff and post that info.

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