The safety whistle is recommended as an essential item for people in the outdoors. A loud whistle for attracting attention and has been designed to aid in land and sea rescue situations. Attached to a buckle which fits any 15mm webbing.
International Distress Signal - 6 blasts of a whistle followed by a pause of 1 minute and then a repetition of 6 blasts. If your signals are heard, there should be an answering whistle - 3 blasts followed by a pause of 1 minute, repeated several times. Continue to signal until you have been located. Unless you require assistance, do not do anything that could be mistaken for a distress signal.