Using an Orienteering Compass - Washington State University
Using an Orienteering Compass By Monica Spicker 2008 BMOC Objectives Identify types and parts of a compass Determine a direction from a
map. Transfer a reading onto a map Follow a reading in the field Take a reading in the field Determine position by resectioning in the field. BMOC Compass styles Azimuth Bearing
BMOC Compass parts Base lines Reading taken or set here To
From Needle Orienting Red arrow. The Fred Shed Screw to set declination: No further calculations needed! BMOC
Magnetic vs True North BMOC Magnetic Declination Compass needle points to magnetic north Maps oriented to true north Difference must be calculated or preset on
the compass itself. True reading (map) = magnetic (needle) + dec By convention east is always + and west is MEAT: Magnetic East Add True BMOC Grid North
The angle at which the UTM grid is oriented. UTM grid lines may be too far off for orienting the compass! BMOC
Determining Direction: Step 1 Compass edge is used like a ruler Fro m From Lost Lake To To this campgroun
d BMOC Step 2 Turn dial so BASE lines are parallel to true north. N of dial must point north. (Red orienting arrow is skewed, because declination is set. ) IGNORE THE NEEDLE!
Read direction here. No further calculations needed! Leave this reading set, if you want to travel this route. BMOC Practice BMOC Following a Set Direction: Step 1 Set the desired reading here
BMOC Following a Set Direction: Step 2 Turn yourself until Red Fred is in the Shed (The red needle is inside the outline arrow in the base plate.) BMOC Step 3: Following a Set Direction Hold the compass LEVEL in front of you.
Flip the mirror down so you see the dial in it. The black line in the mirror should appear to go through the reading. Make sure Red Fred is still in the shed! The sighting notch in
the black cover points to your target. Repeat when you reach your first target until you reach your target. Count BMOC Resectioning Intersection of two line features to determine position.
Road and elevation Creek and road One or more directions drawn on map and another line feature. BMOC Resectioning Examples Intersection of trail and stream
Intersection of stream and elevation 11400 Intersection of 2 trails BMOC Resectioning with compass directions Take compass readings on two prominent landmarks (A and B) that you can identify on
a map. Plot these on the map. Intersection is your position. B A Your Location in Field X Taking a Reading
Hold compass level in front of you Flip down the mirror until you can see the dial. Aim the sighting notch in the compass at the target Turn the dial until Red Fred is in the Shed The direction is read at the hinge end of
the dial. Look at target BMOC Plotting a Direction: Step 1 Set heading on compass FROM: If you shot
from a known point, then lay this end over the point on the map Compass edge acts like a ruler TO: If you shot to a known point, lay this end over that point on the map BMOC
1) Turn entire compass until base lines are parallel with true north on map and the N on the dial is north Step 2 2) Draw line along compass edge BMOC
Step 3 For resectioning, repeat with a second line feature or second compass reading Intersection is your location. Lost Lake is now found! If plotting a distance from a known point, mark off the distance to see the objective.
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