Learn to whistle. Pipe the Side. All Men on Deck. Heave to. Man the Yards. Classic bosun whistle makes deck hands happy. To man the sails, go aloft, or defend the ship in action, "All hands on deck" was one of the commands blown by the Bosun's Mates on this whistle or "call". Its shape hasn't changed in five centuries.
Every bosun call comes with instructions for use including many signals needed on how to run a tight ship.