What does ULB stand for?

Underwater Locator Beacon

This definition appears very rarely and is found in the following Acronym Finder categories:

Science, medicine, engineering, etc.

Other Resources:

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Samples in periodicals archive:

The underwater locator beacons on the plane's flight recorders are designed to emit continuous "pinging" signals for about a month.

Waters may prevent recovery of flight recorders

The H-72 is commercial Eurocopter EC-145, which includes standard features such as air conditioning, jettisonable crew doors, an underwater locator beacon, Traffic Collision Avoidance System, and a fixed beam cargo hook.

Airscoop

Fitted with an underwater locator beacon, the capsule is designed to withstand the harsh environments of ocean going passenger ships, ferries, and large cargo ships, including those associated with an accident, such as impact, deep sea pressure and fire.

L-3 Communications Enters Agreement With Kongsberg Maritime Ship ...

L-3 Communications Selected as Supplier of Hardened Voyage Recorder ...