Morse code is a method of transmitting textual messages using a series of patterns. Each text unit in the pattern can be represented (or reproduced) using on-off tones (sound), flashing lights, or clicks representing “dots” and “dashes” (known as dits and dahs).
In a military or survival situation where silence must be maintained in order to mask your presence from an enemy, foe, or target, several types of non-verbal communication (visual signals) are available including flags, pyrotechnic, chemical lights, ground-to-air signals, and hand and arm signals.
One of your first concerns when you find yourself in a survival situation is to communicate with your friends or allies. In a survival situation, you must first get your rescuer’s attention, then second, send a message your rescuer understands.