Quote Originally Posted by vic n View Post
This just doesn't seem right.....we know the boat (and the transducer) were in motion. Otherwise we would have a horrible pic. So as the cone moves from deep to shallow, the leading edge of the cone will "see" the fish from the tail to the back to the front and begin making an arch (2D). The targets would not be disregarded because they would start to appear as the angular cone picks up the fish above the current "bottom" that the cone is seeing. If there is masking, it would have to occur when the leading edge of the cone reaches a point above the fish. This may cause a cut off arch, but surely not complete masking. Remember, the point defined as the bottom in this illustration was below the fish and then moved into this position. It's my belief that the true masking would happen when the boat is moving parallel to the drop off
Yeah ... wouldn't the fish be "seen" by the 2d cone (front edge) BEFORE it started climbing up the ridge, and just be images in the history of the screen scroll ???

... ya'll are just making my point about 2d being somewhat a useless technology, when it's paired with down scan imaging.

... cp