GEBCO chart Sea of Japan

GEBCO is stand for "General Bathymetric Chart of the Oceans", one of the foundamental international association of chart study, established by Prince Albert I of Monaco in the chair
http://www.gebco.net/about_us/project_history/

Consequently, the 7th International Geographic Congress (Berlin, 1899) nominated a Commission on sub-oceanic nomenclature, which was also responsible for the publication of a general bathymetric chart. The Commission convened in Wiesbaden (April 15-16, 1903), with Prince Albert I of Monaco in the chair, and adopted the characteristics defined in a memorandum by J. Thoulet. The 24 sheets of Carte générale bathymétrique des océans printed in Paris in 1905, hastily prepared, were harshly criticised by E. de Margerie.

The description of Sea of Japan as follows;

1st edition (1904) Sea of Japan : Bassin du Japon
Strait of Korea:nil
Broughton bay:nil
Yellow Sea:nil
East (China) Sea:nil

2nd edition (1914) Sea of Japan : Mer du Japon
Strait of Korea:Det de Tsushima
Broughton bay:nil
Yellow Sea: Mer Jaune
East (China) Sea:Mer Du Cin Orientale


Concrusion,

"Sea of Japan" was used as intenrnational conventional words in each countries e.g. U.K, U.S ,France, German and so on. Those situation was quoted by International organization e.g. GEBCO on 1904 charts. So It can concluded that the Korean claims that "Sea of Japan is colonial/expansionist name" is distorure.