page_title: Underwater locator beacon
hierarchical_section_title: Underwater locator beacon
caption_attribution_description: English: An underwater locator beacon (ULB) for use with a Flight Data Recorder or Cockpit Voice Recorder, with a ballpoint pen to provide scale. The ULB battery life expiry date (July 2014) is visible on the data label.
context_page_description: An underwater locator beacon is a device that guides search and rescue teams to a submerged aircraft by emitting a repeated electronic pulse.
context_section_description: An underwater locator beacon is a device that guides search and rescue teams to a submerged aircraft by emitting a repeated electronic pulse.
caption: An underwater locator beacon (length: 4 inches (10 cm)), with a ballpoint pen to provide scale
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