Humminbird is america s favorite fish finder helping you find fish easier with the best imaging clearest sonar and most accurate lake maps and charts for over 40 years.
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One of the first practical depth sounders the so called hayes sonic depth finder developed by the u s.
The device uses hawkeye s depthtrax sonar where multiple 300 watt 200 khz sonar pulses are emitted four times per second at a 14 degree beam angle to continually update the readings.
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The hawkeye depthtrax 1h is a handheld depth finder that is waterproof down to 200 feet and delivers accurate depth readings from 1 5 to 400 feet.
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Establish a depth reading baseline anchor moor the vessel in a body of water away from other boat traffic.
Navy in 1919 consisted of 1 a device to generate and send sound waves to the ocean floor and receive the reflected waves and 2 a timer calibrated at the speed of sound in seawater that directly indicated water depth.