
compass
Presentation
•
Physical Ed
•
12th Grade
•
Medium
Jacob Davidson
Used 20+ times
FREE Resource
18 Slides • 4 Questions
1
compass and map
By Jacob Davidson
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3
the base plate is clear so you can read the map underneath
base plate
4
the ruler on the side of your compass is used to help you calculate distances on a map
Ruler
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is marked with degrees from zero to 360 the degrees are used to give you a bearing
Rotating Bezel
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marks where you will read your dial from for bearings
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Index line or dot
7
is used to help orient the bezel
orienting arrow
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you point this in the direction you are wanting to take your bearing
Direction of travel arrow
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you use these to line up with the north south lines on a map. be sure that north on the compass is pointing north on the map or your bearings will be 180 degrees off
orienting lines
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Declination
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is the angle difference between magnetic north and true north based on your location Our declination is 8 degrees
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Silva 1-2-3 system
lay your base line along your direction of travel
line up the orienting lines with the North South Lines on a map so with North on the Bezel pointing North on the map
put the red magnetic arrow inside or on the orienting arrow
once you have done this, your direction of travel arrow will be pointing you in the right direction
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Multiple Choice
Why is the base plate clear?
to help you line up to a land mark
so you can use it to heat up water with sunlight
so you can see the map underneath it
because thats how the company makesit
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Fill in the Blanks
Type answer...
15
Multiple Choice
what is marked with degrees from 0-360 on it?
rotating bezel
index line or spot
magnetized needle
declination
16
Multiple Choice
what is the angle difference between magnetic north and true north based on your location called
delination
declination
linear lines
orienting arrow
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5 colors of a map
Blue - water features like lakes, ponds and streams.
Black - man-made objects or rock features like roads, trails, buildings, cliffs, boulders.
White - open woods you could run through
Green - thick vegetation (light green) or fight (dark green) that you might want to avoid
Yellow - open land, semi-open land, where you can look up and see the sky like fields or power lines.
Brown - land features like earth banks or contours
Subject | Subject
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19
scale
Scale refers to the relationship between the size of the map and the actual size of area that is mapped, or relative distance.On a 1:10,000 scale, one of any unit on the map equals 10,000 of the same unit on the ground. Orienteering typically uses "meters" to measure distance.
Subject | Subject
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Contours
Contour lines and the brown squiggly lines you see on the map. They represent elevation in the landscape. As a beginner, you only need to know that the closer the lines are together the steeper the landscape.
Subject | Subject
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compass and map
By Jacob Davidson
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