C&GS Chart 5101A, 1939, a prototype chart incorporating bathymetry acquired with RAR navigation by the C&GS out to oceanic depths. This chart was meant for navigation by following bottom contours. No other chart like this was ever produced as WWII intervened and the use of electronic navigation systems became widespread. The C&GS surveyed the continental margin of the U.S. by 1939.
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Added On | 18th October 2015 |
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