| Summary: | Maintenance and Update Frequency: asNeeded Statement: Original field data. Credit Data collected on the Marine National Facility (MNF) RV Investigator voyage IN2024_V01. The MNF must be acknowledged in all outputs derived from Data and/or Samples collected by, or with support from, the MNF. Acknowledge the MNF in outputs with the statement: “We acknowledge the use of the CSIRO Marine National Facility (https://ror.org/01mae9353 ) in undertaking this research.” Acknowledgment and citations should be in all forms of publication including presentations (where the acknowledgement should be on the closing slide), journals, books, reports and related research outputs. This record describes bioacoustic echosounder data collected on RV Investigator voyage IN2024_V01, 'Multidisciplinary Investigations of the Southern Ocean' which departed Hobart on 05/01/2024 and returned to Fremantle on 05/03/2024. The Simrad EK60 split beam echosounders for18kHz and Simrad EK80 split beam echosounders for 38, 70 120, 200 and 333 kHz were used to acquire acoustic backscatter data to a range of 250-1500 m, from Hobart, along the Antarctic ice edge to Fremantle. All frequencies were logged continuously for the extent of the voyage. Some frequencyies were set to passive for periods of the voyage. Impedance issue Data are stored in *.raw, *.bot and *.idx format at CSIRO. There are 2,595 files totalling 249 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.
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