Like slabbacks mentioned...455kHz is a good search tool ...because the screen is brighter all the way to the edges of the display...(but overall a fuzzier image)...
Then the 800kHz is a good "close inspection" tool...because it's crisper close to the boat...(but darker out to the edges of the display)...
Here's the same structure scanned with each frequency to see the advantages (and disadvantages) of each frequency...
(There are no dumb questions when asked by one willing to learn)...
Rickie


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