Plotting a bearing on your map
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Plotting a bearing on your map. Castle Rock Quad. 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.

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Plotting a bearing on your map l.jpg
Plotting a bearing on your map

Castle Rock

Quad

  • 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.


You can use your compass as a protractor l.jpg
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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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.