Cruise ID: HLY24TE
Multibeam System: EM122
Dates: August 13-14, 2024
- Elevated sea state and corresponding bubble sweepdown issues severely impacted data quality during the initial calibration attempt on June 20; a second, successful attempt was carried out in calm water on Aug 13, 2024
- The USCGC Healy (HLY) is equipped with a Kongsberg Maritime EM122 multibeam echosounder (1° TX x 2° RX) with Seapath 330+ (primary) and Applanix Oceanmaster POS MV (secondary) navigation systems
- The Multibeam Advisory Committee (MAC) was asked to assist with Quality Assurance Testing (QAT) of the ship’s multibeam echosounder ahead of the 2024 field season; due to scheduling constraints, MAC personnel provided remote support for line planning and data analysis
- MAC communication with Healy and UCSD/STARC personnel (primarily Emily Shimada, Max Hughes, and Brendon Mendenhall) commenced in May 2024 with planning to effectively repeat the 2020-23 QATs off the coast of Washington, including: • calibrations (‘patch tests’) for the EM122 with Seapath active and POS MV logged for post-processing • opportunistic testing of swath accuracy, swath coverage, EM hardware health, and RX noise level vs. speed
- The calibration and accuracy test plan was developed with proven test sites used for other vessels, including the 2017 and 2020-23 Healy EM122 QATs; detailed reports of the 2014 (Alaska), 2017, and 2020-23 testing are available at https://mac.unols.org/ship/healy/
- Approximately 48 hours was allotted for the QAT, broken up over two testing windows in June and August
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