Alot of sonar intrepertation is having been there done that. (Knowing what is under the beam.) One good piece of this forum is the pictures that can be posted of sonar shots. (snapshots) then an explanation of the picture. this is where the learning curve is lowered for new folks. You will find many piecres of pictures in the gallery. And if you post a snapshot, chances are someone can tell you what the picture is telling you. chuck