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If a compass is not available, one's position can be determined by sighting three known landmarks. To identify unknown landmarks reverse the procedure for identifying position. With only one line of sight, the exact position of the landmark can only be determined if one has enough knowledge of the country and of maps to know how distant the feature is, its shape, and its position with reference to intervening ridges. Determining intervisibility.—Experience in reading topographic maps can usually show approximately whether any two points should be intervisible. This may be checked by a procedure such as follows: |
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