What is the distress signal? How to send a distress signal?

South O.S is an international morse code rescue signal, not an abbreviation of any word. In view of the frequent maritime accidents at that time, it was often impossible to send out distress signals in time and organize rescue as quickly as possible, resulting in heavy casualties and property losses. 1908, the international radiotelegraph convention officially identified it as an international universal distress signal.

Using Morse code to send SOS distress signal is an international emergency distress mode. This code represents S as "…", that is, three short message numbers; O stands for "-",which means three long signals. The length of a long signal is about three times that of a short message. In this way, SOS can be represented by any signal of "three short, three long and three short".

You can use light, such as switching flashlights, miner's lamps, emergency lights, car headlights, indoor lighting or even blocking kerosene lamps, and you can also use sounds, such as whistles, whistles, car horns or even knocking at the door. Every time a group of SOS is sent, pause for a moment before sending the next group. ?

Generally speaking, repeating the action three times symbolizes asking for help.

In addition to the popular SOS, the international mountain distress signal is to whistle six times per minute (or wave six times, fire six times, etc. ), then be quiet for one minute and repeat.

Extended data:

Other ways to ask for help

1, sound for help

In case of danger, in addition to shouting for help, you can whistle, smash washbasins, smash objects with wooden sticks, smash doors and windows with axes or other metal devices that can make sound, and even break glass and other objects to send distress signals to the surrounding area.

Step 2 use a reflector

In case of danger, it is the most effective way to reflect signals by backlight. Commonly used tools include flashlights and available reflective objects, such as mirrors, jars, glass plates, glasses, reflectors, etc. Flash 6 times per minute, pause 1 minute, and then repeat.

3. Parabolic help

When high-rise buildings are in danger, you can throw soft objects, such as pillows, books and empty plastic bottles. , to attract the attention of the following and indicate the direction.

4, fireworks for help

When in danger in the wild, light three fires in a row, and the distance between the two fires should be equal. Flammable smoke during the day (burning fresh branches, grass and other plants produces thick smoke), and dry wood can be lit at night, giving off bright and dazzling fire to ask for help around.

5. Ground help sign

Ground signs can be made on relatively open ground, such as grass, beach and snow. Use all available materials, such as branches, stones, tents and clothes.

For example, cut the grass into certain signs, or step on certain signs in the snow to contact with the air. Please remember these words: SOS (HELP), SEND (Send), DOCTOR (Doctor), Help (Injury), TRAPPED (Trapped), LOST (Lost) and WATER (Water).

Step 6 leave a message

When you leave a dangerous place, leave some signals so that rescuers can find and know your location or the location you have been to in time. Leaving direction signs along the way will help rescuers find your action path and help them to be guides when they get lost. ?

References:

China government network -3. How to ask for help in distress