plotting a bearing on your map you have just located the first point in an orienteering course. the...
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Plotting a bearing on your map
• You have just located the first point in an orienteering course. The clue indicates that the next location is 1.2km away on a bearing of 286° True. Your GPS indicates that you are currently at 586362m E 4113408m N.
• Use the Castle Rock Quad and follow along as we locate our next course point.
Castle RockQuad
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You can use your compassas a protractor
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Plotting a bearing on your map
• You have just located the second point in an orienteering course. The clue indicates that the next location is 1.9km away on a bearing of 138° True. Your GPS indicates that you are currently at 585220m E 4113710m N.
• Use the Castle Rock Quad and follow along as we locate our next course point.
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Plotting a Magnetic Bearing
• Standing at a known road junction, we sight a bearing to a nearby mountain top. We get 234° Magnetic as our bearing.
• The local declination is 15°E so we add 15° to 234° to get 249° True.
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Plotting a Magnetic Bearing
• We set our compass to 249°
• We line the north-south parallel lines in the bezel up with a north-south line on the map.
• We move the compass until the edge is on the road junction.
• We draw the bearing line onto the map.
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Plotting a Magnetic Bearing
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Getting a Bearing from the Map
• Place the edge of the compass along the desired line of travel.
• Rotate the bezel until it is lined up with true north.
• Read the true bearing
• Convert to magnetic by subtracting the 15° declination.
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Compass Plotting Exercise
• Castle Rock USGS Quadrangle
• What is the true bearing from White Rock to the small pond just west of Zayante Road?
• What is the magnetic bearing?
• What water feature might you be looking at from White Rock at a bearing of 208° M?
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Orienting your mapusing your compass
• Adjust the compass to look like the declination diagram.
• Set the compass down on the map with its edge parallel to a true north line.
• Rotate the map and compass until the magnetic needle is boxed.
• Don’t do this on a metal surface.
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