Fish finders with bottom scan

Bottom scan

— in this case, bottom scanning is not just “viewing” the space under the boat (all modern echo sounders are capable of operating in this mode), but scanning using special technologies. Such technologies may have different names and nuances of application, but they use a common principle — narrowing the echo sounder beam to a narrow transverse band. Reducing the space covered in this case is a positive thing, because. it increases the resolution and allows you to get very detailed images of underwater objects. However this feature significantly affects the cost of the device.