Navy team surveys Tonga below the waterline

DGSTs chart the safest route using high-frequency sonar equipment attached to Zodiac inflatable boats to take high-resolution images of the sea floor. “Data is collected in a planned line pattern to assess the water depth,” Petty Officer Duthie said. “We apply our collected data to known tides and satellite imagery of reef formations to chart the safest beach approach.” DGSTs…

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