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    Silicon Sea Cruise INFO
    From: Dan Hogan
    Date: 2001 Mar 23, 5:02 PM

    I have had several inquires asking what the Silicon Sea cruise is, so:
    The Silicon Sea cruise is a series of navigation problems in the form of a
    circumnavigation. The navigation problems follow a route around the
    world(see below).
    Newbies, Oldbies, In-between-be's and anyone just plain interested, join
    in. The only requirement is PARTICIPATE. If you are new to navigation,
    ASK questions on the list. This is a learning exercise for all of us.
    This set of problems will start in April at the latest. The tentative
    schedule of posts will  be the the first and third wednesday of the month.
    This portion of the Silicon Sea cruise will start with Leg 69,
    approaching Bridgetown, Barbados. Bridgetown is scheduled as a refitting
    point for the trip to the Panama Canal, HawaII, and San Pedro CA(Home
    Obviously those doing their navigation the old fashioned way, working for
    it, will need a current Nautical Almanac and Sight Reduction method. The
    dates for the problems will be concurrent with the current (2001)
    Nautical Almanac. Leg 69 will require using the year 2000 Nautical
    Almanac. However, the problems can be worked with computer navigation
    programs or calculators.
    All cruise and navigation information will be lifted from the DMA Pilot
    Charts, Jimmy Cornell's World Cruising Routes, and any documents and
    charts available within the working group without incurring added
    expenses. This is a navigation exercise, not a simulated virtual voyage.
    Mallorca, Spain; Valleta, Malta; Port Said; Transit Gulf of Suez and Red
    Sea; Adan, Yeman; Maldive Islands; Cape Leeuwin, AU; Bass Strait, AU;
    Sydney Harbor, Australia; Wellington, New Zealand; Cape Horn;
    Barbados; Panama Canal; HawaII; San Pedro, CA (home port). Be aware this
    is the planned route, STUFF Happens.
    I recommend a Navigation Log Book, aka. Spiral Binder, to keep track of
    your doings. Believe me it can't be done 100% on a computer.  A
    navigation reference text is recommended. Which ever text is issued by
    your local government is satisfactory.  There are many commercial volumes
    as well.
    The minimum tools you will need:
        1) A pencil and ERASER.
        2) Something to draw straight lines with.
        3) Something to layout angles with.
        4) Something to use as a plotting sheet.
        5) Something to calculate trig. formulas with.
        6) A current Nautical Almanac for sight reductions and sun problems.
        7) A pair of dividers.
        8) A Sight Reduction method. (229, 211, spreadsheet, etc. or...
        9) For us lazy souls, a Computer or Calculator Navigation Program of
          your choice.
       10) Plotting Sheets or a piece of paper to make a plotting sheet.
    Anyone who thinks of something I missed post it to the list.
    Below is Dan Hogan's QED plotting for the financially under-privileged.
    Blatantly stolen from Self Contained Celestial Navigation with H.O. 208,
    John S. Letcher, 1977, International Marine, ISBN 0-87742-082-3.
    Use lined paper, college ruled, Turn the paper 90d, so the lines are
    vertical. Ruled lines are used for longitude. Every sixth or twelfth line
    is darkened to represent a whole degree of longitude. (depending on the
    scale desired).
    Lines of latitude are added by construction, starting with the lowest
    latitude desired. Whole degrees are 60 miles.
    >From your lowest Latitude line, at the most R/H longitude line, draw a
    line at an angle up from the Latitude of your lowest latitude line plus a
    0.5d(i.e.:28.5d). For ten miles to each vertical line use 6 lines; for 5
    miles to the line use 12 vertical lines. Where the angled line crosses
    your 6th and/or 12th line swing an arc until it touches your R/H
    vertical longitude line. This is the point of the next latitude line.
    Draw a line perpendicular to the longitude across the page. Repeat the
    process with each higher latitude (29.5d), etc.
    The bottom angle line, where it crosses the the intermediate vertical
    longitude lines, is the distance interval. 10 miles each line for 6 line
    spacing. 5 miles each line for 12 line spacing. This forms a handy scale
    of miles or minutes of latitude.
    The accuracy is within the tolerance of your #2 pencil point.
    Dan Hogan
    West Covina, CA
    Owner Navigation-L List

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