Hi Italo !I have a question about fish finders. I served in the Royal Canadian Navy as a Sonarman a while back and have a complete and thorough understanding of how this sound emitting equipment operates.. My concern is, “Why does the fishing industry continue misrepresent and to refer to a fish finder as sonar when they do not transmit sound of any sort.Sonar in fact stands for (So)und, (Na)vigation and (R)anging S.O.N.A.R.Now we all know that fish finders do NOT emit sound and CAN NOT be used for navigation purposes. So, could could the fishing world please refrain from this misrepresentation. I is just wrong in every sense of the word.I feel that the fishing industry has some explaining to do.

Posted on November 8th, 2018

Hi Calvin, the boating/fishing industry indeed refer to fishfinders/sonar to identify the electronics used to mark underwater objects like bottom, aquatic vegetation, suspended material and fish. Fishfinders operate using a single frequency transducer, dual frequencies, multiple frequencies or a broadband CHIRP system. In general, higher frequencies give the finest detail resolution, the least background noise on your screen and the best view from a fast-moving boat, but don’t penetrate as deeply as lower frequencies. Shallow-water inland anglers generally choose higher frequencies of 200kHz, 400kHz or 800kHz. For maximum depth, use lower frequencies. We recommend 200kHz or higher (up to 800kHz) for water depths up to 200′ and 80kHz or 50kHz for deeper waters….God bless you.

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