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SIYHALF.TXT
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SIYHALF.TXT Compass Theory & Operation 6
Chapter 1/2
Compass Theory and Operation
If you do not have a Silva Ranger compass, then skip to
Chapter 1_C.
Honest! I really didn't plan on a Chapter 1/2. There really is
a god, and Her Name is Serendipity! Some people have complained
that Chapter 1 is too long, and then I had to make it even longer
to accommodate the new Ranger. There is a lot to cover in using
the Silva Ranger, and you are learning to survey too. It might
take more than one pass to understand it all. If it takes more
than three passes, then complain. My address and phone number
are at the end of the chapter.
Don't think that you can take a shortcut by reading the little
Instruction Manual. If you think that this technical writing is
half-assed, then you oughta be enthralled by the Ranger
Instruction Manual. This is one case where you should NOT read
the instructions before operation. Silva's Instruction Manual is
so bad that I must limit my warranty.
WARRANTY NOTICE!
The warranty of CAVE, Inc of the
SURVEY IT YOURSELF: instructions
will be VOIDed if you read the
Silva Ranger Instruction Manual!
I strongly suggest that you do not look at Silva's instructions
before you look at mine, or you run the grave risk of declaring
yourself stupid.
Silva Compass now has a new and improved version of the old
standby Ranger 15T. The author has not personally field tested
this new and improved version, and makes no claims that it is fit
for any purpose whatsoever, including Surveying It Yourself.
Eventually, these new and improved upgraded Rangers will be given
the cave test. Two previous models of the Ranger were used to
survey many miles of cave under the most abusive of environmental
conditions. Anything that goes into a cave can be pretested by
being stirred in a bucket of mud, tossed down a stone staircase,
and then washed in a washing machine. And still work. You could
depend on the old Rangers to get you to hell and back. Or at
least to survey to the end of The Backdoor To Hell Cave.
SIYHALF.TXT Compass Theory & Operation 7
There is no magic in a compass, not even a fancy compass. If you
thought that you were buying magic, then I will give you your
money back. Reluctantly. I wish that you would have forewarned
me.
The only thing that might pass for magic is that the red end of
the compass needle points North. Even if you don't really
understand it all, you can still survey it yourself. I have a
Master's degree in geology, and I don't understand it all either.
It is sufficient for many useful purposes to have an instrument
which will point in the same direction as any other of its kind.
This enables people to communicate direction on The Earth's
surface, or indeed under The Earth's surface.
You have probably used a common compass to tell which way was
north. And I am sure that all of you have watched The Sun rise
in The East, and set in The West. The mere fact that The Sun
stays put and The Earth moves underneath it does not impair The
Sun's usefulness for finding direction.
Those of you who don't live in a cave or in a big city probably
have watched The Sun rise in The East many times. You might have
even noticed that The East isn't always in the same place. The
mere fact that The East isn't always in the same place does not
impair its usefulness for determining direction.
If you give directions from Sunrise, you must take into account
the fact that Sunrise moves. Maybe this doesn't make much
difference for the job at hand, or maybe it does. You decide.
For example, if you wanted to tell someone the direction from
your house to the house in which your brother lives (without
being there to point to it) you might say that it is the house
towards where the sun rises and a little around to the right. If
there are only a few houses in the village, this amount of
precision might work just fine. If you are installing spaceport
runway landing lights, it might not be good enuf. You decide.
Hopefully, I have gotten this far without telling you anything
that you didn't already know. A compass points North, just like
a Sunrise points East. Knowing that, the next question should
be, "What is the standard deviation?"
If your question is, instead, "What is Standard Deviation?", then
you are about to learn something new. If you have any rituals
which must be first performed, then perform such rituals now.
SIYHALF.TXT Compass Theory & Operation 8
Hocus. Poke us.
Standard Deviation is merely a way to come closer to the answer
to the question, "How close should I expect to come to the
truth?" Just like ole Sunrise, the direction in which the compass
points isn't always the same. It might be good enuf for what you
are doing, it might not. You decide. Standard Deviation is a
more precise way to measure precision, used by people whose
business it is to ask what the numbers mean. Or don't mean.
All the fancy on the Ranger enables you to determine a direction
precise to about one degree. This is quite sufficient for
preliminary surveying, and most of the time this is all that you
need. Even if you need more precision, it is usually well worth
your while to do a preliminary survey. A precision of one degree
is about what you can draw with a paper and pencil and ruler and
protractor. Is that good enuf? You decide.
Is it too good?? Most of the time I would be happy to have a
freehand sketch on the back of an envelope. This, plus a cryptic
description of what to find when you get there, has been the
standard way to describe property locations since the invention
of writing. If you need a more precise description, then with
SURVEY IT YOURSELF: you have the instruments and instructions for
doing so. Continue.
There are a bunch of gadgets on the Ranger which increase its
precision from that of a napkin sketch to pen & ruler quality.
I'll tell you more about them when you need them.
The Ranger compass can be used just like a tourist store compass
to tell which way is north. The red end of the compass needle
points north. This is good enuf to navigate while driving on
unfamiliar roads, or to find your way back to the lodge.
The Ranger compass can be used just like any decent hiking
compass to orient maps and get directions precise to about ten
degrees. Turn the compass until the arrow under the compass dial
lines up with the compass needle. Read the direction from the
compass dial on the edge towards the landmark in question.
There is also a way to get a direction precise to one degree with
the Ranger. You will learn how to do this when the proper time
comes. Meanwhile, you can use the Ranger just like any other
compass with which you are familiar. Ignore the gadgetry you
don't need. It is ignoring you.
SIYHALF.TXT Compass Theory & Operation 9
No magic. Magic is for magicians and bankers. If anything about
the compass seems like magic (except for the fact that the red
end of the compass needle points north), then you had best think
about it until the magic runs out. It might help to get out a
map of someplace familiar (the United States for example) or
better yet, a globe.
Copyright (c)1994 by David Perry Beiter
If you have any problems with my instructions, then contact me.
CAVE, Inc, 1/2 Fast Road, Ritner, KY 42639. Dave, 606/376-3137.
MCI Mail:635-1762 byter@mcimail.com
X.400: c=US;a=MCI;s=BEITER;d=id=6351762
from CIS: >MCIMAIL 635-1762 (be sure to include your name in the text)
If you have problems with the Silva Ranger instructions, then
contact Silva Compass, Johnson Camping, Inc, POB 1602,
Binghamton, NY 13902-1604. Customer "Service": 800/572-8822