Intervals between sounds in a command are 2–3 seconds, intervals between commands are over 30 seconds (e.g., repeating a command requires a gap of over 30 seconds)
Communication (T): ■■■ (one long sound) Used for audible communication within the group to determine the direction of each other’s whistles; respond with this signal after hearing a whistle command.
Assembly (U): ● ● ■■■ (two short, one long) Move toward the direction of the whistle.
Move out (V): ● ■■■ (one short, one long) Issued while resting means the whole team sets off; issued during movement means to speed up.
Front team wait (W): ● ■■■ ■■■ (one short, two long)
Used when the team is traveling too far apart, requiring the front team to wait for the rear team.
Request support (S): ● ● ● (three short) Issued when in difficulty and needing help; those who receive it reply with a communication sound (T) to indicate they will come to assist.
Distress signal (SOS): ● ● ● ■■■ ■■■ ■■■ ● ●
● (three short, three long, three short) This is the internationally recognized SOS code.
Reminder: don’t use this (whistle) for games or fun—if used repeatedly… wolf’s coming!!!
Personal suggestion: friends engaging in outdoor activities should carry a survival whistle—its usefulness in critical moments can be significant.