Quick Answer
To signal SOS effectively from a boat at night, use a high-intensity light source like a strobe or an SOS flashlight, and flash the Morse code sequence (three short flashes, followed by three long flashes, and then three short flashes again) in a visible direction. Aim the light for a distance of at least 1-2 nautical miles. Timing is crucial, so use a metronome or a timer to maintain the exact sequence.
Choosing the Right Light Source
When selecting a light source for signaling SOS, consider its intensity, beam width, and battery life. A strobe light with a high intensity of at least 10,000 candelas and a beam width of 1-5 degrees is ideal for long-distance signaling. For shorter distances, an SOS flashlight with a higher intensity and adjustable beam width can be used. Ensure the light source has sufficient battery life to maintain the signaling sequence for at least 30 minutes.
Signaling Technique
To signal SOS effectively, use the Morse code sequence of three short flashes, followed by three long flashes, and then three short flashes again. The short flashes should be 0.2-0.5 seconds long, while the long flashes should be 0.5-1 second long. Use a metronome or a timer to maintain a consistent pace of 3-4 flashes per second. Aim the light for a distance of at least 1-2 nautical miles to ensure visibility from a safe distance.
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