Back Balise de localisation sous-marine French 水中ロケータービーコン Japanese

Underwater locator beacon

A 4-inch (100 mm) underwater locator beacon, with ballpoint pen for scale
A ULB attached to a bracket on a cockpit voice recorder

An underwater locator beacon (ULB), underwater locating device (ULD), or underwater acoustic beacon is a device that emits an acoustic pulse intended to guide searchers equipped with a suitable receiver to the location of the beacon underwater.

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