ok
best way to explain it is
think of shining a flashlight at night in the woods
the beam of light hits trees and say a deer is hiding between
two trees will return a target (or an image)you'll see it
or NOT if it goes completely behind them, out of site...
think of the trees as cover for the moment
likewise in the water
a fish isn't usually stationary and as it moves thru the tranducers
beam it sends you a signal... if it's small and on the edge of the beam it might not even ping
and if its huge then it can shadow or cover
a fish beneath it because the signal can't reach it
but the fishfinder will see it if its " in the cone" angle
of the beam
but if that same fish is just outside of it ( the cone)
it may not see it at all...........
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