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A Review Of How Fishfinders Work

By Greg Holmes

Fishfinders have become the gadget of choice for avid sport fishermen. These sturdy, easy to use fish locating devices allow them to scan an area for fish that are feeding. They can even tell the size of the fish, thus saving a lot of time and frustration. If you’re fed up with small fry catches, then one of these portable devices may be just what you need. In this article, we’ll look at how fishfinders work and help you decide if they’re right for you.

Sonar signals are what allow these devices to work. The transducer that is mounted to your boat sends a signal below the craft. The signal is cone shaped. When the signal makes contact with objects like fish, weeds and other underwater structures, the signal or echo is sent back to the boat and is displayed as a chart on your screen. The power of the transducer will determine how long this process takes. As you can see, fishfinders are a great help to anglers because they’ll never again waste time in an area where fish aren’t feeding.

One of the most important features to look for in a fishfinder is a simple operating mechanism. The idea is that you should be able to simply switch on the unit and be able to easily assess the situation. You want an accurate readout, and many fishfinders are correct up to 600 feet. A sonar chart will show you exactly what’s below you as you’re moving. The menu should let you fine tune the unit’s sensitivity. The fish will show as a straight line when you are stationary. However, although fishfinders can be amazingly accurate, sometimes branches and other debris can result in a false reading.

The frequency that you use can make a difference to the accuracy of your readout. As a rule, you’ll want to use a 83 kHz frequency in deep salt water, and 200 kHz in water that is less than 300 feet in depth. You’ll find that at 200 kHz the definition and detail will be superior, but it won’t penetrate as deeply.

Fishfinders are great tools but no piece of technology is a substitute for instinct. If you feel that your trophy catch is hiding in a certain spot, go ahead and hit it with everything you’ve got! As every avid angler knows, there’s nothing like the thrill of a great catch.

Need help deciding on the right fish finder? Don’t know if the Lowrance X67C Fishfinder With Transducer is better than the Eagle Cuda 300? Click here to find fish finder reviews that will make the choice easier for you.

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Article Citation
MLA Style Citation:
Holmes, Greg "A Review Of How Fishfinders Work." A Review Of How Fishfinders Work. 30 Jun. 2010. 4 Aug 2014 <>.

APA Style Citation:
Holmes, G (2010, June 30). A Review Of How Fishfinders Work. Retrieved August 4, 2014, from

Chicago Style Citation:
Holmes, Greg "A Review Of How Fishfinders Work"

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