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2017 Nautilus Spring Quality Assessment Report

Cruise ID: NA079
Multibeam System: EM302
Dates: May 1-6, 2017

The E/V Nautilus undertook a multibeam echosounder quality assurance test from May 1 to May 5, 2017 during an engineering shakedown leg (NA079) in order to perform an assessment of the vessel’s Kongsberg EM302 multibeam echosounder. Data were collected near the Southern Channel Islands (Figure 1), offshore from San Pedro, California. Paul Johnson and Lindsay Gee provided logistical and technical support for mission planning, data collection, and analysis. This report presents:

  • An overview of the data collected and the processing methods applied to it;
  • A history of all changes made to the system configuration, starting from the initial install and up through the most recent path test calibration;
  • An accuracy assessments at two depth ranges and swath coverage analysis across all depths surveyed;
  • Amplitudes and spectra of vessel self-noise measured by the multibeam receiver at various speeds and headings relative to a prevailing swell;
  • EM302 impedance data to document receiver and transducer health

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