How Do You Do A Resection With A Map And Compass?
If you can locate two or more distant terrain features on a map, you can use resection to pinpoint your exact location. Pinpoint a distant feature of the terrain such as a hilltop, stream or road junction on the map. Using a compass, measure the exact magnetic direction from where you are to the feature. Convert the magnetic direction to a map north direction by subtracting the magnetic variation provided on the map (there should be a small diagram on the map that helps you accomplish this). Calculate the reverse direction of the map north direction (180 degrees from map north). Put the center point of a protractor on the exact map location that you sighted to with your compass. Line up the 0-degree mark on the protractor with map north. Make a mark on the map next to the protractor at the number of degrees of the reverse direction. Remove the protractor and draw a long line with a straightedge and mechanical pencil from the pinpointed distant terrain feature through the mark you just
