Data are collected underway by several different vessels, including fishing and research vessels. Data collection procedures have been developed for each of the participating vessels. The procedures have been devised to optimise the quality and utility of the collected data while considering the operational needs of the vessels. A summary of the participating vessels is provided in the table below.
Vessels are calibrated annually but logistics may dictate different time intervals. Vessels are calibrated according to the procedures recommended in the ICES CRR 144 document by (Foote 1987). In the case of ES60 systems, the calibration data is pre-processed to eliminate the possibility of bias of up to +/- 0.5 dB due to the systematic triangle wave error that is embedded in the ES60 data (Ryan and Kloser 2004).
- Foote, K.G. 1987.
Calibration of acoustic instruments for fish density estimation: a practical guide. International Council for the Exploration of the Sea. CRR 144.
- Ryan, T.E., and Kloser, R.J. 2004.
Quantification and correction of a systematic error in Simrad ES60 Echosounders. ICES FAST, Gdansk.