For echo sounder equipment, calibration is needed for optimizing results in fish finding. The echo sounder is very sensitive for water condition like salt level and temperature condition so when the echo sounder is calibrated the results are optimized. With the New EU roles its needed to bring all sort of fisch on board, so therefore fine tuning the Echo sounder equipment is a must. It becomes major important that the ships sees the right fish and catch it. Meaning after the calibration job the echo sounder results are 100 % more effective with calibrated equipment.