4 · Society, Civilization, Culture
46 · social and economic life, transport and communication
46C · traffic and transport
46C2 · traffic on the water
46C21 · ships (in general)
46C21(+6) · ships (in general) (+ departure and arrival ~ traffic and transport)
46C21(+63) ·
ships (in general) (+ under way, at sea (~ travelling))