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Fishfinders were derived from fathometers, active sonar instruments used for navigation and safety to determine the depth of water. [1] The fathom is a unit of water depth, from which the instrument gets its name. The fathometer is an echo sounding system for measurement of water depth. A fathometer will display water depth and can make an ...
The basic components of the scientific echo sounder hardware function is to transmit the sound, receive, filter and amplify, record, and analyze the echoes. While there are many manufacturers of commercially available "fish-finders," quantitative analysis requires that measurements be made with calibrated echo sounder equipment, having high ...
Echo sounding or depth sounding is the use of sonar for ranging, normally to determine the depth of water . It involves transmitting acoustic waves into water and recording the time interval between emission and return of a pulse; the resulting time of flight , along with knowledge of the speed of sound in water, allows determining the distance ...
NMEA 0183 is a combined electrical and data specification for communication between marine electronics such as echo sounder, sonars, anemometer, gyrocompass, autopilot, GPS receivers and many other types of instruments. It has been defined and is controlled by the National Marine Electronics Association (NMEA).
Garmin Ltd. is an American multinational technology company based in ... $200 $300 $200 $300 $250 $300 $350 ... cartography, [137] fishfinders, [138] SONAR, [139 ...
The company began as a division of the American company Raytheon, a manufacturer of defense systems, when it launched its first echo depth sounder in 1923. In 1958 ,Raytheon was able to increase its product offering and market share through the takeover of Apelco. In 1974, Derek Fawcett, a British-born inventor and long-time sailor, founded ...