Now, looking for places to make Catfish sets, I'm really paying a lot more attention to the bottom readings. So I notice some things that seem odd to me. The difference between a fairly smooth bottom line, and the Dark thick line. As I recall, the Dark thick line is the Muddy or soft bottom causing multiple's of the Ping. So what are the Dark thick lines that extend upward as if it were a Telephone pole or a large column? In one area I saw a long stretch of Muddy bottom with a lot of those lined extending up like columns. One more thing I just noticed about this little unit is the increase in the number of Fish Icons just at the instant the Fish-easy is changing Depth's. At first I really thought there were lots of fish there. Doing a circle confirms it must be some noise or some Software anomoly when the Transducer is about to the limit of it's frequency response for that depth. ALSO, my Fish-easy has four sized Fish Icons. Small, a bit bigger, bigger yet, and huge. Anybody know if the Icon represents one fish or a bunch of em'? My book says nothing about the different sized Icons.