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in the distance, choose two whose direction is separated approximately by a right angle (for greater accuracy). Orient the map by compass, place a match vertically on the map above the position of one of the known landmarks, move another match along the near edge of the map until it aligns with the landmark, and draw a light line between the two vertical matches. Then repeat the
Fig. 11. Method of determining intervisibility. process for the other known landmark. The intersection of the two lines thus obtained will be near your position. A more precise determination can then be made by sighting on additional known landmarks. |
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