It seems to answer its own question. this is marine operation ( from ships and boats) on the Ham or Amateur radio wavelengths. Not to be confused with the various Marine bands used by Merchant shipping companies, Phone companies ( Marine Operator calling) etc. By the way radio waves carry greater over water as they generally do at night. The Night side is ideal.
Deutscher Amateur-Radio-Club's motto is 'Federal Association for Amateur Radio in Germany'.
International Amateur Radio Union's motto is 'Representing the Interests of Two-Way Amateur Radio Communication'.
Radio Amateur Association of Greece was created in 1958.
Bangladesh Amateur Radio League was created in 1979.
Japan Amateur Radio League was created in 1926.
International Amateur Radio Club was created in 1961.
Northwest Amateur Radio Society was created in 1985.
Deutscher Amateur-Radio-Club was created in 1950.
Amateur Radio Society of India was created in 1954.
Radio Amateur Society of Thailand was created in 1963.
Korean Amateur Radio League was created in 1955.
International Amateur Radio Union was created in 1925.