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## PowerPoint Slideshow about 'Plotting a bearing on your map' - Olivia

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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.
- Use the Castle Rock Quad and follow along as we locate our next course point.

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.

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.

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.

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.

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?

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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