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  2. Crutchfield Corporation - Wikipedia

    en.wikipedia.org/wiki/Crutchfield_Corporation

    Crutchfield Corporation is a North American retailer specializing in a wide range of electronics, including mobile audio and video equipment for the automobile, along with speakers, televisions, and other electronics for home or portable use, serving both the United States and Canada. It was created in 1974 by William G. "Bill" Crutchfield, Jr ...

  3. Marine electronics - Wikipedia

    en.wikipedia.org/wiki/Marine_electronics

    Marine electronics refers to electronics devices designed and classed for use in the marine environment on board ships and yachts where even a small amount of salt water can destroy some electronics devices. Therefore, the majority of these types of devices are either water resistant or waterproof.

  4. Marine VHF radio - Wikipedia

    en.wikipedia.org/wiki/Marine_VHF_radio

    Marine VHF radio is a worldwide system of two way radio transceivers on ships and watercraft used for bidirectional voice communication from ship-to-ship, ship-to-shore (for example with harbormasters), and in certain circumstances ship-to-aircraft.

  5. Vehicle audio - Wikipedia

    en.wikipedia.org/wiki/Vehicle_audio

    Mobile audio power amplifiers. Amplifiers increase the power level of audio signals. Some head units have built-in stereo amplifiers. Other car audio systems use a separate stand-alone amplifier. Every amplifier has a rated power level sometimes noted on the head unit with the built-in amplifier, or on the label of a stand-alone unit.

  6. Echo sounding - Wikipedia

    en.wikipedia.org/wiki/Echo_sounding

    They are ubiquitous in the boating world and used on a number of different marine robotic vehicles. It operates by using a transducer to emit a pulse through the water and listen for echos to return. Using that data, it's able to determine the distance from the strongest echo, which can be the seafloor, a concrete structure, or other larger ...

  7. RT-841 - Wikipedia

    en.wikipedia.org/wiki/RT-841

    RT-841 is the base component VHF radio transceiver used by the United States military in manpack and vehicular radio configurations, including the AN/PRC-77 (manpack), AN/VRC-64 (vehicular) and the AN/GRC-160 (vehicular with manpack accessories).