What is an international distress signal?

SOS is an international distress signal. In daily life, SOS is usually understood as "saving our ship" and "saving our soul". However, it is not interesting to formulate the specification at first, because Morse code is all-point and all-flat, which is easy to record. Universal remote control expression: distress mode 1: sound, three short three long three short (... _ _ _) Morse code. Help method 2: lighting, such as flashlight, three short, three long, three short (switching lights) Other methods: fire is in the dark, and fire is the most effective signal means. Light three fires and let them form a triangle (international distress signal) or a straight line. Each fire is about 25 yards (23 meters) apart. As long as time and circumstances permit, light them as soon as possible and be careful not to put them out until you need them. If you are alone, it may be a little difficult to keep three fires burning, so protect one fire. When lighting the signal fire, you should consider your geographical position. For example, if you are in the jungle, find a natural clearing or make a fire by the stream to avoid the fire being blocked by the leaves of the jungle. If there is no natural open space, then you need to clean up an open space. If you are in the snow, you may need to clear the snow on the ground or build a platform to make a fire, so that the fire will not be put out by the melting snow. Burning trees is another way to attract attention. Trees containing resin will catch fire even if they are not dried. For other types of trees, you can put some dry wood on the lower branches and light it, so that the fire will burn and ignite the whole tree. Before the trees are burned out, cutting down some small trees that are not dead and then adding them to the fire can produce more smoke. Be sure to choose trees far away from other trees to avoid forest fires and endanger your own safety. Smoke can be used to attract attention during the day. The international distress signal is three smoke columns. You should try to distinguish the color of smoke from the surrounding background: if the background is light, use black smoke, and vice versa. If you add some green leaves, moss or water to the fire, the smoke will turn white; If you add some rubber, oil-soaked rags, etc. On the fire, the smoke will be black. In desert areas, smoke can't rise, it always lingers on the ground, but in open desert areas, pilots can still see it. Using smoke as a signal is usually only suitable for relatively sunny days. Strong winds, rain and snow will disperse the smoke and reduce the possibility of your being found. Smoke bomb. If you have smoke bombs, you can use them like flames. Be sure to keep grenades dry, make sure they are effective when needed, and be careful not to ignite the surrounding plants when using them. The pilot of M 186 signal gun has this life-saving device on his life jacket, including a gun tied with a green nylon rope. When fired, the pencil bullet sounds like the sound of a pistol shooting. The range of the bullet is 500 feet (152 meters) high, and the diameter of the air range is about 10 feet (3 meters). If you want to keep the bullet on standby at any time, you can take it out of the package, screw it partially into the pistol, put the trigger of the pistol in the non-firing position, and then hang it around your neck with a rope or chain to get ready. Once the rescue plane appears, it will immediately take off and prepare for the second launch. At the same time, we should also be prepared for concealment in case the pilot mistakenly regards the flare as enemy fire. Star pyrotechnic flare. Red is a dangerous color in the world, so if possible, please use red fireworks flares, but any color can help rescuers find your location. This star-shaped pyrotechnic flare has a range of 200 to 265,438+05 meters, can burn continuously for 6 to 65,438+00 seconds, and its falling speed is 65,438+04 meters per second. Sky parachute flare This flare has a range of 200 to 265,438+05 meters and a falling speed of 2.65,438+0 meters per second. M 126 (red) can burn for about 50 seconds, and M 127 (white) can burn for about 25 seconds. At night, the visible range of these flares is 30 to 35 miles (48 to 56 kilometers). Mirrors or flashing objects On a clear day, mirrors are the best signal devices. If you don't have a mirror, you can polish your water cup, belt buckle or other similar objects to reflect sunlight. Concentrate the reflected light in one place to avoid the enemy's sight. Practice using mirrors or flashing objects to signal now, and don't wait until you need to use them. MK-3 signal mirror hangs the signal mirror around its neck with rope or chain, ready for use at any time. But be sure to stick the reflective side on your body to prevent it from being discovered by the enemy. Warning: Don't use the mirror to signal too quickly, because the pilot may mistake the signal for the enemy firing. The light should not shine directly on the cockpit of the plane for too long or more than a few seconds, because it may dazzle the pilot. Haze and fog may make it difficult for pilots to see the signals from flickering objects. Therefore, if possible, send signals to the highest terrain around them. If you can't see the plane, send a signal to the direction where the plane is making noise. Note: In most environments, under normal circumstances, the reflected signal of the mirror can be seen from 70 miles (113km). If you are in a desert area, you can see it from 100 miles (160 kilometers). Flashlight or flash You can use a flashlight or flash to send SOS signals to the plane at night. When using the flash, be careful not to let the pilot mistake it for an incoming bullet. The flash flashes 60 times a minute. Some flashlights have infrared covers and lenses. VS- 17 signal board. You can use VS- 17 signal board to send signals during the day. Turn the orange side up, because orange is easier to see in the air than purple. Shaking the cloth board will make it easier for the pilot to find it. Clothes. Putting clothes on the ground or at the top of a tree is also a signal way. Choose objects that have obvious contrast with the surrounding colors and arrange them into a large geometric pattern, which is easier to attract attention. Natural materials If there is no other way, natural materials can also be used to form symbols or information that can be seen from the air. You can build mounds that can cast shadows, or you can use any kind of shrubs, leaves, rocks or snow. In the snow-covered area, you can step on the snow by force, and after stepping on some letters or symbols, put some contrasting materials (such as branches) into the letters or symbols. On the sand, gravel, plants or seaweed are used to form patterns. In areas with many shrubs, cut down shrubs or scorch the ground according to the required pattern. In tundra areas, dig ditches or turn over turf. No matter where you are, you should use contrasting materials to arrange symbols so that the crew on the plane can see them.