Fish finders 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 automatic permanent record of measurements. Since both fathometers and fishfinders work the same way, and use similar frequencies and can detect both the bottom and fish, the instruments have merged.[2]
2-4 PERSON CAPACITY: Comfortably sized 2-4 people capacity including set-up dimensions of 81" x 71" and 71" high with plenty of room to fish and even stand up inside of.|POP-UP STYLE SETUP: Sets up super quick and tears down just as easily by simply pulling up on the roof and then on all four sides so youÆll be good to go in minutes.|FULLY INSULATED FABRIC: Features 300 denier insulated oxford fabric with frost-resistance up to 22 degrees Fahrenheit to keep you warm no matter the weather.|DURABLY DESIGNED: Includes solid fiberglass poles, diecast hubs, and heavy duty zippers designed for repeated use plus 4 strong ground stakes and 4 pull ropes.|WELL-VENTILATED ACCESS: Two zippered doors on opposite ends and hook and loop fastened windows allow for easy access and provide a well-ventilated.
Now let’s imagine another scenario – again your sonar is stationary, but this time 2 fish swim through your sonar beam, one big and one small. The big fish swims very quickly through the sonar beam, the small one swims slowly. Which one will make the longer fish arch on your screen? The answer is the small one. That’s because a slow moving object will leave a longer mark than a fast moving one, whatever their size.
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