During the transit, multibeam data will be collected 24 hours a day and XBT casts will be conducted no less than every 6 hours. Singlebeam (EK60) data and sub-bottom profile data will be also collected 24 hours a day.

Multibeam, single beam, and subbottom sonar data will be collected 24 hours a day. XBT casts will be conducted regularly for multibeam calibration. The ship's Scientific Computing System (SCS) will monitor and collect oceanographic, navigation, and meteorological data throughout the cruise.

Multibeam data was collected 24 hours a day and XBT casts were conducted at an interval defined by prevailing oceanographic conditions, not to exceed 6 hours. Additionally, EK60 single beam and sub-bottom profile data was collected 24 hours per day. Data was only collected in foreign waters where clearance was granted. Where no permit was obtained, all data collection systems were shut down in those foreign waters. All multibeam was fully processed according to standard onboard procedures.

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NOAA Ship Okeanos Explorer will operate 24-hour multibeam and singlebeam mapping surveys over a 3,937 nautical mile transit over the western extent of the New England Seamount Chain, including the following seamounts: Balanus, Bear, Buell, Mytilus, Physalia, Panulirus, Picket, Retriever, Asterias, Atlantis II, Gosnold, Kelvin, Kiwi, and Sheldrake in accordance with requests from the scientific community. Additionally, survey mapping will complement existing data collected as part of the US Extended continental shelf program, and was designed in consultation with ECS scientists.

Multibeam and singlebeam mapping operations were conducted 24 hours a day throughout the cruise. Sub-bottom profile mapping was conducted 24 hours a day at the discretion of the CO. Most of the mapping areas pursued during this cruise were never mapped with modern sonar before. Mapping activities focused on three primary areas, (1) some potential underwater cultural heritage sites south of Oahu, (2) the Necker Island area within the Papahānaumokuākea Marine National Monument (PMNM), and (2) the Karin Seamount Chain near Johnston Atoll within the recently expanded Pacific Remote Islands Marine National Monument (PRIMNM).

Operations used the ship's deep water mapping systems (Kongsberg EM302 multibeam sonar, EK60 split-beam fisheries sonars, Knudsen 3260 chirp sub-bottom profiler sonar, Teledyne RDI Workhorse Mariner and Ocean Surveyor ADCPs), NOAA's two-body 6,000m remotely operated vehicle (ROVs Deep Discoverer and Seirios) system, CTD rosette, and the ship's high-bandwidth satellite connection for real-time ship to shore communications. ROV dives were mostly conducted during the day, while CTD casts, and multibeam, singlebeam, and sub-bottom acoustic mapping occurred when the ROV was on deck. Exact locations of discrete ROV dives and mapping operations were to be determined during the cruise as results of engineering and shakedown tests were evaluated and once weather and operational constraints were factored in.

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This dataset contains oceanographic data collected from NOAA Ship OKEANOS EXPLORER in the North Pacific Ocean from 2023-04-13 to 2023-04-27. Data acquisition from shipboard sensors includes navigational data, METOC data (altimetry, conductivity, depth, dew point, fluorescence, oxygen, pressure, relative humidity, relative wind speed, salinity, sound speed, sound velocity, temperature, true wind, turbidity, water temperature, wind, wind direction, wind speed), vehicle data (ROV time to surface, traction winch data, line rate data), Profile Data (ASVP, CTD, and XBT), event logs, images, ROV ancillary data, and sample specimen data.