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PLEASE HELP!!!!!!! What technological development during the 1930s allowed for the collection of more and better undersea data and, therefore, the creation of nautical charts?

PLEASE HELP!!!!!!! What technological development during the 1930s allowed for the collection of more and better undersea data and, therefore, the creation of nautical charts?
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PLEASE HELP!!!!!!! What technological development during the 1930s allowed for the collection of more and better undersea data and, therefore, the creation of nautical charts?

User Alfonsoolavarria
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The creation of SONAR - Sound Navigation and Ranging - was developed during the 1930's and allowed for the collection of expansive undersea data and the creation of nautical charting.
User Oijafoijf Asnjksdjn
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