Down Scan Mille Lacs Mud Flat
I am working on a good description of how StructureScan works; details on the cone shape and cone angles for side scan and down scan. But for this page we will keep it simple.
Down scan is similar to side scan in that it looks down and to the sides and not to the front or back. Traditional sonar has a cone shaped area under the transducer so it ‘sees” front, back and to the sides. Down scan also uses a higher frequency (455/800) than traditional sonar (200).
These pictures are of a mud flat in Mille Lacs Lake, Minnesota. The mud flats are mid lake humps composed of hard mud and some have rocks. Top and bottom of the drop off are softer than the sides of the drop off. The edges of the drop off are deeply rutted.