I. How to use the signal to ask for help
If you ask for help, you can take a variety of methods
[Light the fire]
Light three fires in a row, It is best to have the same distance in the middle. Smoke can be burned during the day. Put some grass and other items on the fire that produce thick smoke, and add 6 times per minute. Can be flammable at night.
[Audio SOS]
Sends a SOS signal from a short distance. Can shout loudly or make noises with the help of other objects, such as hitting trees with axes and sticks.
[Using the mirror]
Using the back light to reflect the signal is an effective method. Available reflective items such as metal signal mirrors, can heads, glass sheets, glasses, retro-reflectors, etc.
[Make a mark on the ground]
You can make ground marks on open ground, such as grass, beach, and snow. For example, mow the grass into a certain mark, or step on a certain mark on the snow; you can also use a branch, seaweed, etc. to form a certain mark, so as to connect with the sky. It can also be indicated by the ground-air contact symbols uniformly specified by international civil aviation.
Memorize these words: SOS (for help) SEND (send) DOCTOR (doctor) HELP (help) INJURY (injured) TRAPPED (launch) LOST (lost) WATER (water)