A whistle is essential equipment for searchers to carry. It is also recommended that individuals carry a whistle on trips to remote areas. It is important to use a whistle that has a rating of 100 decibels or higher so that they can be heard from long distances when used. Some examples are whistles rated above 100 decibels are below.
- One blast = Where are you?. Also used to respond to other whistle signals.
- Two blasts = Used to signal a halt during a sound and light search
- Three blasts = I need help! (distress, emergency)
- Four blasts = Come to me (recall).