2024 R/V Healy EM122 QAT

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

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2024 R/V Sally Ride EM712/EM124 QAT & Seapath 380-R3 SAT

Ship ID: R/V Sally Ride Multibeam System: EM712/EM124/Seapath 380-R3 Dates: April 3-5, 2024 R/V Sally Ride (SR) received an upgrade of its Seapath 330 navigation system to dual Seapath 380s The primary Seapath 380 employs a new Seapath MGC-R3 (“Seapath 380-R3”) and the secondary Seapath 380 uses the pre-existing MRU 5+ (“Seapath 380-5+”); both systems are logged by the EM124 and EM712 While no changes were made to the MRU 5+ installation, the original Seapath antenna locations were modified for a longer baseline and a second antenna pair was added; all Seapath antennas are NovAtel GNSS-850 units A new survey was conducted by Westlake Consultants to determine the installation offsets of the new MGC-R3 and new antenna locations using the existing reference frame (established by IMTEC during the 2021 SBP29 installation and EM124 topside upgrade) The Sally Ride conducted routine quality assurance testing (QAT) between April 3-5, 2023, focusing on:

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2024 R/V Armstrong EM712/EM124 SAT

Cruise ID: AR81-02 Multibeam System: EM124/EM712 Dates: March 14-20, 2024 R/V Neil Armstrong (AR) received several significant upgrades to its multibeam mapping systems during the 2023-24 winter shipyard period in Charleston, South Carolina Primary upgrades included: Replacement of the original EM122 with an EM124 (1.0° TX / 2.0° RX) Replacement of the original EM710 with an EM712 (0.5° TX / 1.0° RX) Installation of a Seapath 380-R3 navigation system with a MGC-R3 Comprehensive new survey of vessel and sensor offsets by Aegis Metrology Installation of new permanent benchmarks at strategic hull locations The MAC was asked to assist with conducting Sea Acceptance Testing (SAT) of the new EM124 and EM712 systems using the Seapath 380-R3; SAT work for a new SBP29 was carried out in tandem by other teams Due to schedule constraints, the MAC provided remote support from shore throughout the SAT; the on-board mapping team included SSSG personnel

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2024 R/V Revelle EM712/EM124 QAT

Cruise ID: RR2401 Multibeam System: EM712/EM124 Dates: February 12, 2024 During the winter 2023-24 maintenance period, the R/V Roger Revelle (RR) underwent significant engine work and received a new Seapath 380 receiver and HMI (the MRU 5+ and antennas were not modified) The Multibeam Advisory Committee (MAC) was asked to assist with routine Quality Assurance Testing (QAT) for the ship’s multibeam echosounders; due to scheduling conflicts, the MAC provided remote support for planning and data analysis leading up to and throughout the QAT Planning followed the standard MAC SAT/QAT checklist, starting with configuration review, hardware health, and noise testing following the engine work; calibrations for both systems were carried out at proven sites near San Diego used by a variety of vessels (e.g., 2023 Sally Ride EM124 and EM712 QAT) Dockside configuration reviews indicated a rollback to outdated offsets for the EM124 (e.g., potentially by loading an older PU parameters

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2024 R/V Sikuliaq EM304 MKII/EM710 SAT

Cruise ID: SKQ202403S Multibeam System: EM304 MKII/EM710 Dates: February 2024 R/V Sikuliaq (SKQ) received several significant upgrades to its multibeam mapping systems during the 2023-24 winter shipyard period in Seward, Alaska Conditions in the shipyard were extreme and complicated all work related to these upgrades; although many components of the winter work package were curtailed by these conditions, the UAF and Kongsberg teams completed all major mapping priority projects: Complete replacement of the original EM302 with an EM304 MKII system (0.5° TX / 1.0° RX) Addition of one Seapath 380-R3 navigation systems with a primary MGC serving the ship and mapping systems; a secondary MGC also serve the ship and acts as a spare for the Seapath 380 / mapping system Comprehensive new survey of vessel and sensor offsets by Westlake Consultants Installation of new permanent benchmarks at strategic hull locations Planned replacement of the EM710 RX array was not

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2024 R/V David Packard EM304 MKII SAT

Cruise ID: R/V David Packard Multibeam System: EM304 MKII Dates: February 15-17, 2024 R/V David Packard undertook a series of sea acceptance trials (SAT) for the ship’s new Seapath 380 / MGC-R3 navigation system and EM304 MKII multibeam echosounder in the vicinity of Vigo, Spain between 15-17 Feb 2024; a combination of contract SAT activities were completed by Kongsberg for Freire Shipyard in tandem with independent pre-SAT and SAT assessments conducted by Johnson and Jerram for MBARI Two important factors will impact performance of this particular EM304 MKII: The high voltage power supply has been reduced by Kongsberg from 130V to 105V to avoid damages observed with other EM304 MKII and EM124 systems; the impacts on performance are not clear at this point, and these concerns have been noted in the signed SAT documents with Kongsberg The ice windows cause acoustic attenuation during TX and RX that will reduce the

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