. Field service notes for : incorporating amendments . (1) To find true, when given magnetic bearing,subtract variation; if result is minus, subtract itfrom 360, — Magnetic bearing = 9°, find variation, i6|° W. 90— i6p = —7f°.3600— y\° = 352*0 = true bearing. 84 (2) To find magnetic, when given true—Add variation; if result is greater than 360°,subtract that, —True bearing 349°; find magnetic: —349° + i6§° = 3654°365A0—3600 = 540 — magnetic —When variation is E.— (1) To find-true, when given magnetic— Add variation; if result is more than 3600, sub-tract t
. Field service notes for : incorporating amendments . (1) To find true, when given magnetic bearing,subtract variation; if result is minus, subtract itfrom 360, — Magnetic bearing = 9°, find variation, i6|° W. 90— i6p = —7f°.3600— y\° = 352*0 = true bearing. 84 (2) To find magnetic, when given true—Add variation; if result is greater than 360°,subtract that, —True bearing 349°; find magnetic: —349° + i6§° = 3654°365A0—3600 = 540 — magnetic —When variation is E.— (1) To find-true, when given magnetic— Add variation; if result is more than 3600, sub-tract that from it. (2) To find magnetic, when given true—Subtract variation; if result is minus, subtract it from find direction of true North— (a) By day, by the sun. (b) By night, by the stars. (c) By plummet. (a) By watch— Manual of Point the hour hand at the sun, a line drawn fromMap-reading, C€ntre Qf the dial to a point midway betweenp the hour hand and figure XII points approximately due south. By Plummet—. From A as a centre describe a circle. Mark spots with pegs at D and E where theshadow of the pole touches the circumference ofthe circle. Bisect the arc between the pegs. Joint AF. (b) By the Stars- Pole -h The North star is in the same vertical plane withthe pole when the star C (Zeta) is vertically aboveor below it. Setting a Map. A. —With a compass, if N. line is shown on the map. B. —Without a compass (if observers position is known). (a) Identify a distant object, , a church; jointhis on the map with your position, turn the mapuntil this line points to the distant object. Sundial Method— The sun at noon is due S. in the Northern hemi-sphere. From E. to W\, 150 per hour. .. At 3 the sun is find Ones Position on the Map.(a) By adjustment— Select three objects on the ground which aremarked on the map. 86 Fasten a piece of transparent paper on a flat sur-face and hx a pin vertically through this pa
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