How does the compass read pictures?

Using the compass, you can make the orientation of the map consistent with the actual terrain, and find out where you are now and the orientation of the destination you are looking for. \x0d\ The compass must be held horizontally, away from the following items, so as to avoid confusion of magnetic needles: the compass should be away from barbed wire10m, 55m from high-voltage lines, 20m from automobiles and airplanes, and10m from magnets such as magnetic containers. \x0d\x0d\ method/step \ x0d \ structure and performance \ x0d \ x0d \ 1. Azimuth measuring mechanism: it consists of compass, azimuth frame, sight and aiming glass. The outer circle of azimuth zoning is divided into 60-00 density zoning, and the unit is 0-50 density zoning; Inner ring 360? Division system, in 5 units? . The accuracy of azimuth indication is 0-25 bits. \x0d\ \x0d\ 2。 Distance estimator: consists of sight and sight. The aiming glass is engraved with distance estimation lines and dense dividing lines. When the distance positioning lines of the shell cover and the shell are aligned and the sight is in a vertical position, the distance fixing line and the sight form a distance positioning fixer with a ratio of10:1; The secret position dividing line and the sight form a secret position ranging evaluator. The ranging accuracy of the distance estimator is 5%. \x0d\ \x0d\ 3。 Pitch angle measuring mechanism: it consists of pitch sight, pitch pendulum and locking mechanism. Its measuring range is 90? , the unit is 5? . Pitch angle measurement accuracy is 2.5? . \x0d\ \x0d\ 4。 Mileage measuring mechanism: consists of mileage measuring wheel, odometer, odometer pointer and gear train. The odometer is1:100000; 1:50000; 1:25000 three points, in kilometers. The mileage measurement accuracy is 2%. \x0d\ \x0d\ 5。 Coordinate ladder ruler: consists of two sets of perpendicular measuring rulers. 80mm long; 20 mm shorter. The unit is1mm. The measuring accuracy of coordinate ladder is 0.5mm \ x0d \ \ x0d \ azimuth measurement: determine the azimuth, calibrate the map, indicate the target, etc. \x0d\ \x0d\ Example 1: Measure the magnetic azimuth from the standing point to the target. \x0d\ \x0d\ Open the compass needle, make the housing cover to the maximum position, lay the compass needle flat, and adjust the angle of the sight (one eye is close to the sight), so that the azimuth indicator line and the corresponding dividing value can be clearly seen through a magnifying glass. When aiming, aim at the target through the long slit and aiming line on the sight. At this time, the density division value corresponding to the azimuth index line is the magnetic azimuth from the standing point to the target. \ x0d \ x0d \ Example 2: Calibrate the map-make the north direction on the map consistent with the true north direction on the spot. \x0d\ \x0d\ Flatten the map and close the long side of the compass coordinate ladder with the magnetic north line on the map (that is, the PP' dotted line in the map). At this time, the starting point of the coordinate ladder should point to the bottom of the map, and rotate the map to make the corresponding value of the compass bearing indicator line indicate zero. The map is now calibrated. \x0d\ \x0d\ Example 3: Measure the magnetic azimuth from the standing point to the target with a map. \x0d\ \x0d\ Calibrate the map according to the method in Example 2, so that the long side of the coordinate ladder ruler of the compass passes through the standing point and the target point or the extension line of these two points, and the starting point of the coordinate ladder ruler should point to the standing point. At this time, the density division value corresponding to the azimuth indicator line is the magnetic azimuth from the standing point to the target. \x0d\\x0d\ Estimated distance: \x0d\ \x0d\ ① The distance between the target and the standing point is known. \x0d\ \x0d\ According to the size of the target interval on the aiming glass, the distance can be estimated by the proportional formula or dense formula of 10: 1. \x0d\ \x0d\ Proportional formula: \x0d\ \x0d\ Distance from the foothold to the target (m) = target interval width (m)x 10/ multiple of the width of two appraisal lines of the target \x0d\ \x0d\ Dense formula: \ x0d \ \. Distance from the foothold to the target (m) = target interval width (m)x 1000/ target occupation density \ x0d \ x0d \ Example 4: It is known that the distance between high-voltage poles in front of the target is 50m and the height of poles is 8m. Two methods, namely proportional ranging and dense ranging, are used to estimate the distance between the target and the standing point. \x0d\ \x0d\ Open the compass, aim at the distance locating line between the shell cover and the shell, put the sight in a vertical position, put one eye close to the long slot of the sight, and observe the target through the dividing line on the aiming glass. \ x0d \ x0d \ The measured distance between two poles (50m) accounts for 1.25 of the width of two estimated lines, which can be obtained by the proportional formula: \ x0d \ x0d \ the distance from the foothold to the pole = 50x11.25 = 4000. The height (8m) of the measured pole occupies two squares (20m) of the dense dividing line, which can be obtained by the dense formula: \ x0d \ x0d \ distance from the foothold to the pole = 8x1000/20 = 400m \ x0d \ x0d \ ② The interval between the target and the station is unknown. \ x0d \ x0d \ Example 5: Build a new bunker on the other side of the river with enemy lines, and estimate the distance from the bunker to the standing point. \ x0d \ x0d \ \ x0d \ Open the compass, and the magnetic azimuth from the target to the standing point is 45-20 Close. Find an auxiliary point in the direction perpendicular to the target, so that the magnetic azimuth value from the target to the auxiliary point changes on the original basis 1-00 \ x0d \ close. For example, when the magnetic azimuth from the auxiliary point to the target is measured to the right. At this time, if the distance from the auxiliary point to the foothold is 40 meters by stepping or other methods, the distance from the standing point to the target is 10 times, that is, 400 meters. \x0d\ \x0d\ Note: If the ranging is reduced by 5% according to the above method, for example, 400m-400x5% = 380m, the ranging accuracy can be improved by about 2%.