chart datum
A river in Africa that rises near Johannesburg and flows about 1,770 km (1,100 miles) to the Indian Ocean in Mozambique.
(informal, intransitive) To do random unplanned work or spend time idly / (informal, intransitive) To attempt to do something with a piece of equipment without understanding how it works.
(nautical) the level below which depths are indicated and above which heights of the tides are expressed; usually mean level of low water at a spring tide
plural of campanularid
入港する前に、その係官は安全に航行できる最小水深を確認するために海図基準面を確認した。
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