Three of anything is internationally recognised as a signal of distress. Three fires in a triangle, three rifle shots, three whistle blasts or three flashes of light. You just keep repeating at a regular interval i.e. Three whistle blasts every minute.
It also helps the search party find you, as it allows the team to stop and listen and constantly adjust direction towards the person or persons requiring assistance.
I recommend John Wiseman's book "The SAS survival handbook" or some of the rescue resources on the Emergency Management Australia site, ema.gov.au if you want to learn more. |