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Kjetil Kjernsmo. "How to Use a Compass", copyright © 2000
by Kjetil Kjernsmo. Reprinted by permission of the author. |
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During Reading Strategy
Record the Steps of the Process
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The
first thing you need to learn are the directions. North, South, East
and West. Look at the figure and learn how they are. North is the most
important.
There are several kinds of compasses, one kind to attach to the map, one
kind to attach to your thumb. The thumb-compass is used mostly by orienteers
who just want to run fast, and this is the kind of compass I normally use.
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But not in this
tutorial. I would recommend the third kind of compass. Let’s take
a look at it:
You see this red and black arrow? We call it the compass needle. Well,
on some compasses it might be red and white for instance, but the point is, the red
part of it is always pointing towards the earth’s magnetic north pole.
Got that? That’s basically what you need to know. It’s as simple
as that. |
Guided Reading Question 1
What is the red and black arrow called?
Click
to answer |
But if you don’t
want to go north, but a different direction? Hang on and I’ll tell
you. |
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You’ve got
this turnable thing on your compass. We call it the compass
housing. On the edge of the compass housing, you will probably have
a scale, from 0 to 360 or from 0 to 400. Those are the degrees or the azimuth1 (or
you may also call it the bearing in some contexts). And you should have
the letters N, S, W and E for North, South, West and East. If you want
to go in a direction between two of these, you would combine them. If you
would like to go in a direction just between North and West, you simply
say: “ I would like to go Northwest.” |
Guided Reading Question 2
Where is the scale on the compass?
Click
to answer |
Let’s use
that as an example: You want to go northwest. What you do, is that you
find out where on the compass housing northwest is. Then you turn the
compass housing so that northwest on the housing comes exactly there
where the large direction of travel arrow meets the housing.
Hold the compass in your hand. And you’ll have to hold it quite flat,
so that the compass needle can turn. Then turn yourself, your hand, the entire
compass, just make sure the compass housing doesn’t turn, and turn
it until the compass needle is aligned with the lines inside the compass
housing. |
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Now, time to be careful! It is extremely important
that the red, north part of the compass needle points at north in the
compass housing. If south points at north, you would walk off in the
exact opposite direction of what you want! And it’s a very common
mistake among beginners. So always take a second look to make sure
you did it right! |
Guided Reading Question 3
What is important about the direction of the compass needle?
Click
to answer |
A second problem
might be local magnetic attractions. If you are carrying something of
iron or something like that, it might disturb the arrow. Even a staple
in your map might be a problem. Make sure there is nothing of the sort
around. There is a possibility for magnetic attractions in the soil as
well, which might cause “magnetic deviation,”2 but they are
rarely seen. Might occur if you’re in a mining district.
When you are sure you’ve got it right, walk off in the direction
the direction of travel arrow is pointing. To avoid getting off the course,
make sure to look at the compass quite frequently, say every hundred meters
at least.
But you shouldn’t stare down on the compass. Once you have the direction,
aim on some point in the distance, and go there. But this gets more important
when you use a map.
There is something you should look for to avoid going in the opposite direction:
The Sun. At noon, the sun is roughly in the south (or in the north on the
southern hemisphere), so if you are heading north and have the sun in your
face, it should ring a bell. |
Guided Reading
Question 4
What will help keep you from going in the opposite direction?
Click
to answer |
When do you need this technique?
If you are out there without a map, and you don’t know where you
are, but you know that there is a road, trail, stream, river or something
long and big you can’t miss if you go in the right direction. And
you know in what direction you must go to get there, at least approximately
what direction.
Then all you need to do is to turn the compass housing, so that the direction
you want to go in is where the direction of travel-arrow meets the housing.
And follow the above steps.
But why isn’t this technique sufficient? It is not very accurate. You
are going in the right direction, and you won’t go around in circles,
but you’re very lucky if you hit a small spot this way. |
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If you are taking
a long hike in unfamiliar terrain, you should always carry a good map
that covers the terrain—especially if you are leaving the trail.
You also need to know how to use a compass along with a map. This can be
somewhat more complicated, because of something called magnetic
declination.
I’m not going to talk about declination here, because that is only
connected to the use of maps. But you may wish to learn about it if you
are serious about using a compass, because it is in the interaction between
the map and a compass that the compass becomes really valuable. |
Guided Reading
Question 5
What should you do if you are in unfamiliar terrain?
Click
to answer |