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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 ...
Simrad's is called SimNet, Raymarine's is called SeaTalk NG, Stowe's is called Dataline 2000, and BRP's is called CZone. Some of these, such as SimNet and Seatalk NG, are a standard NMEA 2000 network but use non-standard connectors and cabling; adapters are available to convert to standard NMEA 2000 connectors, or the user can simply remove the ...
Firstly, the surveyor can use an air filled metal bar lowered below the transducer, attached at each end by a rope marked with depth values. If the values on the rope can be assumed to be correct, then the bar is lowered at set depth intervals and observed on the echo sounder trace. The values of echo sounder depth can be plotted against the ...
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 ...
The earliest and most widespread use of sound and sonar technology to study the properties of the sea is the use of a rainbow echo sounder to measure water depth. Sounders were the devices used that mapped the many miles of the Santa Barbara Harbor ocean floor until 1993. Fathometers measure the depth of the waters. It works by electronically ...
After two consecutive years of more than 20% gains for the S&P 500 — an achievement not seen since the late 1990s — Wall Street strategists foresee a slower pace of gains for the benchmark ...
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