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單項選擇題

When out of sight of land, a ship’s position can be found by using（）.

A.the coastal navigation
B.the celestial navigation
C.traditional navigation
D.the great circle navigation

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單項選擇題

When visibility is reduced to about 5 miles, we say that visibility is（）.

A.very good
B.good
C.poor
D.moderate

單項選擇題

When your vessel is proceeding to the area of traffic density,（）is used to determine the exact ranges of other ships or objects in the vicinity.

A.radar
B.GPS
C.DF
D.satellite navigator