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start on Auto, and adjust sidescan distance to 2 or 3 times what the depth is

ya, just dont be afraid extreme setting combos. you can always reset with Auto.

If rocks look elongated, definately try scroll speed changes.

conditions make it variable, but I got a nice long range result with Gain 51, Int 22, and Scroll Speed at 50

This was 350khz at 200ft range, copper palette