A.astronomical observation
B.hydrographic survey
C.weather prediction
D.current sailing
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A.ahead
B.astern
C.alongside my port bow
D.alongside my starboard bow
A.in
B.on
C.at
D.for
A.in
B.on
C.by
D.with
A.with
B.by
C.on
D.in
A.at
B.in
C.on
D.above
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