hi. im looking for a way to figure out how deep the fish on side imaging is, when im out in the open water. and thougt i might be able to narrow down a little bit by switching between 455 and 800 khz. so my question is: if im in a place where the lake is 600 feet deep, and got my unit set to 90 feet to eatch side im going to see 180 feet wide and 90 feet deep. (with 455 khz) with the 800 khz i would still see 180 feet wide, but what would be the distance(depth) between what i see and the surface? at 22,5 feet, 45 feet, 67,5 feet and 90 feet of to one side? and will i be able to see the fish as good with the 800 khz as i can with the 455 khz?

stig