The invention of the marine chronometer in the late 18th century enabled Western explorers, such as Jean Francois de Galaup from France, William Robert Broughton from Britain, and Adam Johann von Krusenstern (Ivan Fyodorovich Kruzenshtern) from Russia, to measure time and longitudes on the sea precisely and map the detailed shape of the Sea of Japan.
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In the United States state of Virginia, state lawmaker David W. Marsden, acting on behalf of Korean-American voters, introduced a bill to the education panel of the Senate of Virginia that would have required public school textbooks to include both Sea of Japan and East Sea as names.
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