Revised: 09/09/2002

                   THE CRUISE OF THE SILICON SEA II

This is a series of navigation problems in the form of a circumnavigation
published by members of the NAVIGATION-L LIST

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The Archived Silicon Sea files and several Navigation Programs may be downloaded
from http://www.wa6pby.com/ with a browser or ftp://ftp.wa6pby.com/nav/ with
an FTP client program.

The problems consist of a mixture voyage planning, Dead Reckoning(DR) and
Celestial Sight Reduction. The first problem is LEG 10, which starts at
Palma de Majorca, Spain. Crosses the Mediterranean Sea down the Suez Canal and
Red Sea, across the Southern Ocean and Cape Horn, up the South Atlantic Ocean,
across the Caribbean Sea. Transits the Panama Canal and heads for San Pedro, USA
via the Hawaiian Islands.

Newbies, Oldbies, In-between-be's and anyone just plain interested, join in.
The only requirement is PARTICIPATE. If you don't know, ASK on the Navigation-L
list.

The problems require the Nautical Almanac or equivilent for the year in which
they were posted:

    Legs 10 - 38 Year 1996 Nautical Almanac
    Legs 39 - 44 Year 1998 Nautical Almanac
    Legs 45 - 59 Year 1999 Nautical Almanac
    Legs 60 - 69 Year 2000 Nautical Almanac
    Legs 70 - 83 Year 2001 Nautical Almanac
    Legs 83 -    Year 2002 Nautical Almanac

Also needed are dead reckoning and Sight Reduction methods of calculation. There
are several computer shareware and freeware navigation programs available that
will greatly aid in learning and can be used instead of the Nautical Almanac.

All other navigation information is lifted from the DMA Pilot Charts, Jimmy
Cornell's World Cruising Routes, and any documents and charts available within
the working group without incurring an added expense. This is a navigation
exercise, not a virtual simulated voyage. There may be an occasional errors in
some of the problems, both intentional and accidental. They are left there to
stimulate discussion by the list.

Leg 63 has been taken by the cyberspace gods and sent to electron heaven.
However each problem is an entity of its own and does not require the previous
Leg to work. There is no Leg 45, it was a break in the sequence during a hiatus
by the author of the problems.

The problems are not copy righted. They may be used and modified as desired. But
credit to the Navigation-L list is appreciated.

NAVIGATION TOOLS:

A marine navigation reference book is recommded. Any government published manual
or general navigation text will suffice.

Also a Navigation Log Book, aka. Spiral Binder, to keep track of your doings.
Believe me it can't be done 100% on a computer.

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.

Below is Dan Hogan's QED plotting for the financially under-privliged.
Blatently 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 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.

Or those with a Laserjet or inkjet printer can download posplot.zip from the
archive site. It will print plotting sheets scaled to the latitude of your
choice in an 8.5 x 11 inch format.


Dan Hogan
West Covina, CA
dhhogan@earthlink.com
http://www.wa6pby.com


