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Why do people think they need the dual transducer?
I use my Dual Beam transducer all the time. While fishing steep edges is only one of the many times a dual beam transducer is nice, as it cuts down on the amount of dead area under the cone.
While fishing around a lot of other flashers, the narrow beam will cut down on interference you get from other units.
While fishing in really deep water, the narrow beam is really nice as you are not looking at such a big area in the water.
While fishing heavy weeds, the narrow beam will pick up less of the weeds and allow you to see more what is going one.
The wide beam is nice for fishing that 30ft range, as it allow you to see fish coming in from the sides really nice.
While fishing stationary, you can watch each of your baits, in 20ft of water with the wide beam or watch only one with the narrow beam.
While fishing on Rocks I really prefer the narrow beam.
While fishing really shallow, without weeds the wide beam is nice.
While fishing the mud for perch, I use the wide beam it helps pick up those roaming fish.
While setting tip-ups, the wide beam is a must, that live bait never wants to stay under the cone.
Just couple examples of when a dual beam is nice