On any fishing vessel you have numerous sources for noise, such as propellers, generators, engines and other hydroacoustic equipment.
When other vessels are fishing in the vincinity using the same sonar as you have, you may also experience acoustic disturbance from these.
With the multiple frequency operation provided, you will still be able to tune your sonar for maximum performance. This will allow you to avoid interference both from your own, and from other vessels.
The multiple frequency operation comes very handy in other situations as well; high and low frequencies have different detection ranges on different conditions and species.
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