Name that Return

[GregAndrew]

Some good interpretations so far. But let me give you a sonar lesson hint. The streak up in the second pic is the downrigger ball being retrieved. There is no cable to see, as I use 100# braid instead of the original cable. Notice what happens to it as it gets closer to the transducer. Also notice how small a 4# lead ball with a GoPro attached looks 120' down. Anyway, here is another image to add to the discussion.