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Several new list members have asked about Silicon Sea. Here are the original
messgaes about the Silicon Sea cruise.
FIRST Message
The Cruise of the Silicon Sea
If you want to join us, do. The only requirement is enthusiasm and
participation in the discussions.
The response for the resumption of the Silicon Sea cruise is overwhelming!
The first problem is just about completed. The plan is to post it next week
or would it be better to wait until after the Spring Break?
Got caught on my first post. Obviously those doing their navigation the old
fashioned way, working for it, will need an Almanac. This makes the
essential tools, Almanac, Plotting tools, plotting sheet, and a Sight
Reduction method. The dates for the problems will be concurrent with the
Nautical Almanac. All other information will be lifted from charts and
documents available to the working group.
In order to save some time, and make it easier on me, the cruise will pick
up where the old one left off, at Palma de Mallorca in the Mediterranean.
The route is consistent with Pilot Charts for the time of year (although
mine date from 1978).
The Route:
Palma de Mallorca-Isl Horadada Light(departure point)-a point at the
entrance to the Strait of Sicily-Port Said-Transit the Suez Canal-Transit
the Red Sea-Adan(planned stop)-Cape Lueewin-Bass Strait-Sydney,
Australia(planned stop)-Cape Horn-Barbados-Boston(home port).
Be aware this is the planned route, STUFF Happens.
I have kept the posts sent from those joining the cruise. If I don't see
your participation you will be asked to WALK around Cape Horn.
Ok, time is running out Leg 10 the *FIRST* problem in the cruise of
ronin.com's SV Silicon Sea will be out on 10/05/96.
SECOND Message
Newbies, Oldbies, In-between-be's and anyone just plane interested, join in.
The only requirement is PARTICIPATE. If you don't know, ASK. That's why we
are doing this.
I recommend a Navigation Log Book, aka. Spiril Binder. To keep track of your
doings. Believe me it can't be done 100% on a computer.
Again the required tools:
    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) Nautical Almanac for sight reductions and sun problems.
    7) A pair of dividers.
    8) For us lazy souls, a Computer Navigation Program of your choice.
Anyone who thinks of something I missed post it to the list.
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 lie is
darkened to represen 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, drawe a line at an angle up from the
Latitude of your lowest latitide line plus 0.5d(i.e.:28.5d). For tem miles
to the vertical line use 6 lines; for 5 miles to the line use 12 vertical
lines. Where the angled line crosses your 6th 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
    dhhogan@XXX.XXX

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