As a fishing guide in Canadian waters, Jeff Gustafson has to be a master of reading electronics. His eyes are glued to his depthfinder screen constantly, as he probes structure around a small island.
He fishes one spot for a while, then trolls quickly to another just 50 yards away. I assume he has pinpointed some brushpiles or perhaps rocks where big spotted bass like to hang out.
He has not fooled any yet.