. Elements of military sketching and map reading . ORIENTATION 31 the direction line on the map do not coincide the mapis not oriented. Resection is a method of locating unknown pointsby taking bearings of two or more known points (Fig,18). You think you are on some point of the roadA—B, and vou want to locate your exact position on. Fig. 19. the map. Facing B there are two distinct landmarkson the left,—the top of the hill (X) and the cottagein front of the pine-wood, both of which you canlocate on your map and identify on the ground. Keep-ing the map oriented, sight towards the hill until th
. Elements of military sketching and map reading . ORIENTATION 31 the direction line on the map do not coincide the mapis not oriented. Resection is a method of locating unknown pointsby taking bearings of two or more known points (Fig,18). You think you are on some point of the roadA—B, and vou want to locate your exact position on. Fig. 19. the map. Facing B there are two distinct landmarkson the left,—the top of the hill (X) and the cottagein front of the pine-wood, both of which you canlocate on your map and identify on the ground. Keep-ing the map oriented, sight towards the hill until thepoint (X) on the map and the actual top of the hillare in the same line of sight. Plot this line of sight 32 ELEMENTS OF MILITARY SKETCHING by drawing a back line through X across the line, obtained by connecting three points (topof hill, X, yourself) would sufficiently locate yourposition on the map if you were certain you were onthe road A—B. In order to definitely deterniine this, a similar X r / / / / / Fig. 20. sight is taken on the cottage and this line of sightplotted in the same manner. Both lines will cross ata certain point. The point of their intersection is yourexact place on the map, as you are on the line vS—X,and also on the line 6^—Cottage. Resection may beused to advantage as a check on the
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