ECT 400S single-frequency

It measures the distance till the first “obstacle” in the water – sediments, seaweeds, and even fish. Therefore, if the bottom of the survey area is covered with seaweed, this basic configuration may not work for such a case.

The measured depth will fluctuate erratically depending on what echo sounder received reflected sound – bottom or vegetation. That means that to get “clean” readings from EchoLogger ECT 400S the bottom should be without seaweeds, ensuring a precise depth measurement.

The benefit of EchoLogger ECT 400S is that it has a very short dead zone of 15cm – a minimum distance it can measure. That makes the system with ECT 400S suitable for very shallow surveys, starting from approximately 30cm deep.