Mapping Watchstander, Neah Baechler, prepares to put the expendable bathythermograph (XBT) equipment away after deploying an XBT. XBTs are launched every ~2-6 hours to acquire temperature  data of the water column down to 760 meters (2,493 feet). These data are used to estimate water column refraction required for multibeam sonar data.

Mapping Watchstander, Neah Baechler, prepares to put the expendable bathythermograph (XBT) equipment away after deploying an XBT. XBTs are launched every ~2-6 hours to acquire temperature data of the water column down to 760 meters (2,493 feet). These data are used to estimate water column refraction required for multibeam sonar data. Image courtesy of the NOAA Office of Ocean Exploration and Research, 2017 Laulima O Ka Moana.

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