Vessel ID: R/V Kilo Moana
Multibeam System: EM122/EM710
Dates: May 22, 2022
- R/V Kilo Moana conducted pre-season Quality Assurance Testing for the EM122 and EM710 multibeam mapping systems, following a series of POS MV troubleshooting steps and a dry dock maintenance period
- Pre- and post-shipyard noise testing indicated stable/acceptable noise levels and no damage in the shipyard
- A multibeam sensor geometry review and POS MV GAMS antenna calibration proceeded normally prior to geometric calibrations (‘patch tests’) at proven sites off Oahu (used previously by multiple vessels)
- Calibration adjustments were reasonably small and applied after data collection
- Swath coverage was assessed for the EM122 using transit data, indicating trends similar to previous years
- Swath artifacts were noted for each system, which may be addressed by software/firmware updates and some runtime setting adjustments; the MAC is available to review additional data to try to identify the root causes
- Following the 2022 QAT, the MAC suggests several next steps:
- Kongsberg has released updates for these generations of EM systems that should be applied as soon as practicable; please consult with Kongsberg technical support to ensure both systems are up to date
- Based on their ages, both systems should undergo comprehensive impedance/admittance assessments (e.g., using a Cypher analyzer) to establish transducer array health; these direct measurements provide much more data than BISTs and will be useful for EOL/capital investment planning
- The MAC is available to assist with additional testing (possibly on-board if schedules and conditions align)
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