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Textfree. TextFree (formerly called Pinger and sometimes stylized as textfree) is a mobile application and web service that allows users to send and receive text messages, as well as make and receive VoIP phone calls, for free over the internet. The service costs nothing because it is supported by ads, but users have the option of paying for an ...
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.
List of unrecovered and unusable flight recorders. Flight data recorders (FDRs) and cockpit voice recorders (CVRs) in commercial aircraft continuously record information and can provide key evidence in determining the causes of an aircraft loss. The greatest depth from which a flight recorder has been recovered is 16,000 feet (4,900 m), for the ...
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Towed pinger locator. A towed pinger locator is a water-borne device used to locate the sonar "ping" from the underwater locator beacon which is fitted to the Cockpit Voice Recorders and Flight Data Recorders installed in commercial airliners. [1] They can locate pingers at depths of up to 20,000 feet (6,100 m) underwater.
A cockpit voice recorder (CVR) is a flight recorder used to record the audio environment in the flight deck of an aircraft for the purpose of investigation of accidents and incidents. This is typically achieved by recording the signals of the microphones and earphones of the pilots' headsets and of an area microphone in the roof of the cockpit ...
Voyage data recorder, or VDR, is a data recording system designed for all vessels required to comply with the IMO 's International Convention SOLAS Requirements (IMO Res.A.861 (20)) in order to collect data from various sensors on board the vessel. It then digitizes, compresses and stores this information in an externally mounted protective ...
They are useful for finding artifacts that have been equipped with an acoustic beacon (pinger) to aid in location, such as cockpit voice recorders and flight data recorders used by nearly all military and commercial aircraft, which have a 37 kHz acoustic pinger to help locate them in case of a crash at sea. [9]: Ch. 2
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