Fig. 7
From: Sounding out life in the deep using acoustic data from ships of opportunity
Monitoring long-term performance and stability of echosounders. Panels (a–d) show 38 kHz calibrated G0 (blue solid line) and \({S}_{a{\rm{c}}{\rm{o}}{\rm{r}}{\rm{r}}}\) factor (red dash line) for (a) FV Rehua (ES38-B SN30218), (b) FV Austral Leader II (ES38-B SN30835), (c) FV Antarctic Discovery (ES38-7 SN111), and (d) RV Investigator (ES38-B SN31167) with consistent echosounder configuration. (e) Spatial and temporal variations in peak power \({P}_{er}\) (measured within 0–1 m range) for FV Atlas Cove (ES38-7 SN171) over a year. (f) A comparison between 18 (ES-18 SN2112) and 38 kHz (ES38-7 SN111) peak power values for FV Antarctic Discovery covering 15 days docking period, highlighting the importance of routine monitoring and calibration.
