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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?
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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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