RV Investigator Voyage IN2023_T01 EK60/EK80 Echosounder

This record describes scientific split-beam echosounder data collected on the RV Investigator voyage IN2023_T01, titled 'Transit + Opportunistic Mapping + XBT AutoLauncher'. The primary objective of voyage IN2023_T01 is the safe and timely transit of RV Investigator from Sydney to Hobart in preparation for future voyages leaving the port of Hobart. The transit is direct with no operational time available for science operations unless underway at full speed. Any available operational time to be spent on opportunistic seafloor mapping – while keeping Expected Time of Arrival in Hobart on track as the primary objective. The voyage took place between November 2, 2023 and November 5, 2023 (AEST), departing from Sydney and returning to Hobart.

Unfortunately, no EK60/EK80 data was recorded on this transit voyage. The drop keel had a locking pin issue at the start of the voyage in Sydney and it was decided by the master and ships crew to keep the port drop keel flush with hull. At full transit speed, and not at it's intended position for any beneficial data, GSM felt that there was a high potential risk in damaging the EK60/EK80 transducers, and therefore did not turn on the sounders during the entire voyage.

Additional information regarding this dataset is contained in the GSM data acquisition and processing report. Additional data products may be available on request.

本记录所涉数据为"调查者号"（RV Investigator）科考船航次IN2023_T01采集的科学分离波束回声测深仪数据，该航次主题为"过境航行+机会主义海底测绘+XBT自动发射器"。航次IN2023_T01的核心目标为安全、准时将"调查者号"从悉尼驶往霍巴特，为后续从霍巴特港出发的科考航次做好筹备。本次航行为直达航线，除非以全速航行，否则无可用作业时间开展科学考察作业。剩余可利用的作业时间将用于开展机会主义海底测绘，同时需确保抵达霍巴特的预计时间符合既定计划，此为本次航次的首要目标。本航次于2023年11月2日至2023年11月5日（澳大利亚东部标准时间）执行，从悉尼启航，最终返回霍巴特港。

遗憾的是，本次过境航行未采集到EK60/EK80回声测深数据。航次伊始于悉尼港时，下放式龙骨出现锁销故障，船长及船员决定将左侧下放式龙骨保持与船体齐平的状态。由于航次处于全速航行状态，且下放式龙骨未处于可获取有效数据的预设位置，GSM认为此时开启EK60/EK80换能器存在极高的损坏风险，因此本航次全程未启用回声测深仪。

本数据集的补充信息可查阅GSM数据采集与处理报告。如需获取额外数据产品，可另行提出申请。