Is there a difference in signal patterns for daytime versus nighttime use?

Signal Patterns for Daytime Use

When signaling during the day, a three-short-blast pattern is recommended. This can be achieved by blowing the whistle for one-second intervals, followed by one-second pauses. For example, three one-second blasts, followed by three one-second pauses, followed by three one-second blasts again. This pattern is clear and easy to distinguish from background noise.

Signal Patterns for Nighttime Use

At night, a three-long-blast pattern is used to signal location. This can be achieved by blowing the whistle for three seconds, followed by a one-second pause. Repeat this pattern for three long blasts and one pause. This signal is more visible in the dark and helps rescuers locate the source of the signal.

Importance of Repetition and Consistency

Regardless of the signal pattern used, it’s essential to repeat the signal at regular intervals. This can be every 30 seconds during the day and every 10-15 seconds at night. Consistency in signaling is critical to maintaining the attention of potential rescuers, and repetition helps to ensure that the signal is not mistaken for background noise.