This record describes scientific split-beam echosounder data collected on the RV Investigator voyage IN2016_V02, which departed Hobart on the 14th-March-2016 and returned to Hobart on the 16th-April-2016. The Simrad EK60 split beam echosounders 18, 38, 70 120, 200 and 333 kHz were used to acquire acoustic backscatter data to a range of 1500 m. All frequencies were logged continuously for the extent of the voyage. The frequencies were] set to passive for the periods of the voyage. Data are stored in *.raw, *.bot and *.idx format at CSIRO. There are 780 files totaling 70.6 GB of raw data in this dataset. No processing has been conducted on this data. Additional information regarding this dataset is contained in the GSM data acquisition and processing report. Additional data products may be available on request.

This record describes the Acoustic Doppler Current Profiler (ADCP) data collected from the Marine National Facility RV Investigator voyage IN2020_V08, titled: "SOLACE - Southern Ocean Large Areal Carbon Export: quantifying carbon sequestration in subpolar and polar waters." The voyage took place between December 4, 2020 and January 15, 2021 departing from Hobart (TAS) and arriving in Hobart. Data was collected during IN2020_V08 for the duration of the voyage excluding short periods of time for GSM data collection, during Silent-R testing and whilst leaving port. Data was collected using UHDAS and post-processed using CODAS. Both the RDI Ocean Surveyor 150kHz ADCP and the RDI Ocean Surveyor 75kHz ADCP were run in narrowband. Internal triggering was used. The drop keel was flush with the gondola when acquisition commenced, lowered to 1.25m below the waterline for 2 hours and lowered to 2m below the waterline for the remainder of the voyage. See the voyage computing and electronics report for more details regarding data acquisition. This dataset was processed and then archived within the CSIRO Oceans and Atmosphere (O&A) Information and Data Centre (IDC) in Hobart.

This record describes the Acoustic Doppler Current Profiler (ADCP) data collected from the Marine National Facility RV Investigator voyage IN2021_V01, titled: "Quantifying krill abundance for krill monitoring and management off the Australian Antarctic Territory". The voyage took place from Hobart (TAS) to Hobart between January 29 and March 24, 2021. Both the RDI Ocean Surveyor 150kHz ADCP and the RDI Ocean Surveyor 75kHz ADCP were run in narrowband for transit to and from the survey area. During survey transects the OS150 was used. Data was collected using UHDAS and post-processed using CODAS. Internal triggering was used for the transits to and from the survey site only. When run on transect lines or during target trawling, triggering was performed via KSYNC, synchronised to the EK80 with a ping frequency between 1 and 2.5 seconds. Please see the voyage computing and electronics report for more details regarding operation. This dataset was processed and then archived within the CSIRO National Collections and Marine Infrastructure (NCMI) Information and Data Centre (IDC) in Hobart.

This record describes the Acoustic Doppler Current Profiler (ADCP) data collected from the Marine National Facility RV Investigator voyage IN2020_V01, titled: "Development of William’s Ridge, Kerguelen Plateau: tectonics,hotspot magmatism, microcontinents, and Australia’s Extended Continental Shelf." The voyage took place between January 10 and March 6, 2020, departing from Freemantle and returning to Freemantle. The primary scientific operations of the voyage were multibeam survey, seismic lines and dredging of the William’s and Broken Ridge features. ADCPs were turned off intermittently to avoid interference with multibeam during surveys. On Jan the 15th the OS75 was reporting excessively high temperatures. According to Uni of Hawaii, this is most likely due to water ingress into the transducer indicating potential failure. Temperatures eventually settled at full-scale (~97 deg C), which had a significant effect on calculated water velocities. Soundspeed was manually set to 1500 m/s (this is a setting sent to the deck box via UHDAS) for real-time processing, however special processing will be required for the period with bad temperatures and therefore bad soundspeed. Despite this, the OS75 worked well for the remainder of the voyage. Data was collected in two parts during the voyage at the following dates: First Part: 10 Jan. 2020 – 18 Jan. 2020 (8 days) Second Part: 12 Feb. 2020 – 06 Mar. 2020 (24 days) Note that there is no data from 19th Jan. to 11 Feb. Subsequently, two datasets have been created and processed separately for each part of the voyage. This dataset was processed (quality-controlled), and then archived by the CSIRO National Collections and Marine Infrastructure (NCMI) Information and Data Centre (IDC).

This record describes the Acoustic Doppler Current Profiler (ADCP) data collected from the Marine National Facility RV Investigator voyage IN2021_V02, titled: "SOTS: Southern Ocean Time Series automated moorings for climate and carbon cycle studies Southwest of Tasmania" The voyage took place between April 14 and April 28, 2021, departing from Hobart (TAS) and returning to Hobart. ADCPs were run in un-triggered mode for the length of the voyage, with occasional outages during periods when the priority was to avoid interference with the multibeams or the acoustic release system. The University of Hawaii’s CODAS software codas_focal_20.04_vbox64.ova was used for processing This dataset was processed (quality-controlled), and then archived by the CSIRO National Collections and Marine Infrastructure (NCMI) Information and Data Centre (IDC).

This record describes the Acoustic Doppler Current Profiler (ADCP) data collected from the Marine National Facility RV Investigator voyage IN2022_V06, titled: "Integrated Marine Observing System: Monitoring of East Australian Current property transports at 27 degrees South." The voyage took place between July 14 to July 29, 2022 departing from Brisbane (QLD) and returning to Brisbane. The ADCP was run for most of the voyage, though it was turned off when EK80 surveys were being performed to avoid creating interference in the EK80 data. ADCP data were collected using the University of Hawaii Data Acquisition System (UHDAS) and post-processed using the Common Ocean Data Access System (CODAS). Both the RDI Ocean Surveyor 150kHz ADCP and the RDI Ocean Surveyor 75kHz ADCP were run in narrowband mode. Internal triggering was used. The drop keel was at 7 m below the waterline for the duration of the voyage. See the voyage computing and electronics report for more details regarding data acquisition. This dataset was processed (quality-controlled), and then archived by the CSIRO National Collections and Marine Infrastructure (NCMI) Information and Data Centre (IDC).

This record describes the Acoustic Doppler Current Profiler (ADCP) data collected from the Marine National Facility RV Investigator voyage IN2022_V03 titled: "SOTS: Southern Ocean Time Series automated moorings for climate and carbon cycle studies southwest of Tasmania". The voyage took place between May 4 and May 15, 2022 departing from Hobart (TAS) and returning to Hobart (TAS). . The ADCP was run for most of the voyage, it was switched to passive mode during PLAOS (Profiling Lagrangian Acoustic Optical System) deployments due to interference with the USBL. The 75 kHz ADCP was turned off in shallow water reducing interference with the EM710. Data was collected using UHDAS and post-processed using CODAS. Both the RDI Ocean Surveyor 150kHz ADCP and the RDI Ocean Surveyor 75kHz ADCP were run in narrowband. Internal triggering was used. The drop keel was set at 7m below the waterline for the duration of the voyage. Please refer to the voyage Computing and Instrumentation reports for further details regarding data acquisition. This dataset was processed (quality-controlled), and then archived by the CSIRO National Collections and Marine Infrastructure (NCMI) Information and Data Centre (IDC).

This record describes the Acoustic Doppler Current Profiler (ADCP) data collected from the Marine National Facility RV Investigator voyage IN2022_V09, titled: "Valuing Australia’s new Gascoyne Marine Park." The voyage took place between November 19, 2022 and December 19, 2022 (AEST), departing from Fremantle and returning to Fremantle. The ADCP was run for a notable part of the voyage, though it was turned off occasionally to avoid creating interference with the sounders and USBL. ADCP data were collected using the University of Hawaii Data Acquisition System (UHDAS) and post-processed using the Common Ocean Data Access System (CODAS). Documentation for these systems can be found in (Hummon, 2009-2021). Both the RDI Ocean Surveyor 150kHz ADCP and the RDI Ocean Surveyor 75kHz ADCP were run in narrowband mode. Internal triggering was used. The drop keel was set at 1.19m below the waterline for the duration of the voyage. Apart from the gap in the data, due to ADCP being turned on/off, and the usually required quality control data cleaning there were no significant ADCP processing-related issues encountered. To access the full voyage plan and other reports and data associated with this voyage, please see the contact information at the end of this report. This dataset was processed (quality-controlled), and then archived by the CSIRO National Collections and Marine Infrastructure (NCMI) Information and Data Centre (IDC).

This record describes the Acoustic Doppler Current Profiler (ADCP) data collected from the Marine National Facility RV Investigator voyage IN2022_V07, titled: "HALO - Halimeda bioherm Origins, function and fate in the northern Great Barrier Reef." The voyage took place between August 15, 2022 and September 7, 2022 (AEST), departing from Brisbane and returning to Cairns. The RDI Ocean Surveyor 150kHz ADCP was run in narrowband mode at the start of the voyage and thereafter in broadband mode, the RDI Ocean Surveyor 75kHz ADCP was run in narrowband mode only. There is no data for the OS75 for the first part of the voyage. Internal triggering was used. Both drop keels lowered to flush with gondola (approx 8m below waterline) to reduce interfer-ence with EM2040 system. See the voyage computing and electronics report for more details regarding data acquisition This dataset was processed (quality-controlled), and then archived by the CSIRO National Collections and Marine Infrastructure (NCMI) Information and Data Centre (IDC).

This record describes the Acoustic Doppler Current Profiler (ADCP) data collected from the Marine National Facility RV Investigator voyage IN2022_V08, titled "Biodiversity Assessment of Australia’s Indian Ocean Territories." The voyage took place between September 30, 2022 (ACST) and November 3, 2022 (AWST), departing from Darwin and returning to Fremantle. As required, one or both ADCPs were turned off in less than 500 m depths to avoid the significant acoustic interference these systems generate, particularly between the OS75 and EM710. Changes to the ADCPs were logged and DAP were informed when multibeam bathymetry was considered a scientific priority. The OS75 was switched off for significant parts of the voyage, especially around Christmas and Cocos (Keeling) Islands while shallow water mapping was being undertaken. Throughout the voyage there were high counts of low-quality position data from Seapath. In collaboration with UHDAS Support, on the 2022-10-10 the ADCP was configured to use POSMV rather than Seapath for position and heading data, consequently the data has been split into two parts. ADCP data were collected using the University of Hawaii Data Acquisition System (UHDAS) and post-processed using the Common Ocean Data Access System (CODAS). Documentation for these systems can be found here: https://currents.soest.hawaii.edu/docs/adcp_doc. Both the RDI Ocean Surveyor 150kHz ADCP and the RDI Ocean Surveyor 75kHz ADCP were run in narrowband mode. The OS150 ADCP was used throughout the voyage. The OS75 was used in deep waters and turned off in shallower waters so as not to interfere with the EM710 Internal triggering was used. The drop keel was at 8 m below the waterline for the duration of the voyage. See the voyage computing and electronics report for more details regarding data acquisition. This dataset was processed (quality-controlled), and then archived by the CSIRO National Collections and Marine Infrastructure (NCMI) Information and Data Centre (IDC).