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The 3 in 1 already covers shallow water well. Both the H and M overlap frequency at 130 and the slightly wider cone angle on the M helps find fish/ ground and will run deeper. I was used to a B60 but the 75m chirp is much, much better for showing detail and fish. I don’t know how much different my experience would be had I bought the H. However I don’t give that any thought as I’m completely happy with what I’ve got. I do fish deeper water sometimes to 200m or so which was another consideration.
thanks - starting to understand it