A.concealed
B.buried
C.existed
D.built
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A.one nautical mile
B.two kilometers
C.5 cables only
D.one fathom
A.a vessel arrives at a port in a evening
B.a vessel leaves a port in a evening
C.a vessel arrives at a port in a morning
D.a vessel leaves a port in a morning
A.by
B.with
C.on
D.in
A.cable areas
B.dumping grounds
C.fish trap areas
D.precautionary areas
A.the period of darkness exceeds the period of light
B.there is only a partial eclipse of the light
C.the periods of light and darkness are equal
D.the period of light exceeds the period of darkness
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On a voyage from Capetown to London，the favorable ocean current off the coast of Africa is the （）.
Conditions for crossing a rough bar are usually best at （）.
The distance between any two meridians measured along a parallel of latitude and expressed in miles is the （）.
Attention is called to the fact that in many cases charted depths may be decreased by up to （）.
Attention is called to the fact that in many cases pipelines are not （） and charted depths may be decreased by up to 2 meters．
The meaning of ebb tide is that （）.
As these features are not all charted，special caution should be exercised （） vessels navigating in the vicinity.
An occulting light is one in which （）.
AFTER DROPPING THE PILOT means （）.
For full information regarding the current circulation of the Indian Ocean,（） Sailing Direction,Current Atlas,etc.