English to French Other Military / Defense

Bonsoir,

À l'époque de la Seconde Guerre mondiale. Des suggestions ?

"BONG STICK
A bong stick is a homing device that is used to alert the receiving vessel of a commando team’s presence. It is more reliable than RG which can often be obscured by high waves in rough seas. A bong stick consists of a metal box and a projecting bronze tube; turning the handle on top of the box causes a hammer to strike the tube, emitting an audible signal that a submarine’s hydrophones or a ship’s ASDIC can detect up to twelve miles away."

Merci d'avance.