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Red X Angler
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I don't think inland waters over 50ft deep hold fish very well around central and eastern NC, no oxygen for them down there. Im not certain.
 
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Red X Angler
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Most better units will do 400-600ft . If you are seeking fish in the higher column you want more "spread" from the sonar cone. Covers more area at shallower depths.
 
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Higher frequencies have a smaller cone but a sharper/more detailed image of returns which makes it easier to interpret what you are seeing on the screen. The trade off is that you might not see something in that smaller cone that you would have seen in the bigger one.
 

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Red X Angler
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My understanding, which is based on vague recollection of some reading, is that under 300ft you won't get much benefit from the narrower beam, but after 300-500 feet depth you might. I never looked further into it because I'm never in water over 150ft.
 
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