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engineer on watch Chief Engineer Chief Mate Master
keeping, set keep, set set, keep to set, keep
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Follow To follow Following Followed
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must keep off have to keep off are keeping off must be kept off
You must keep your course and speed You may change course and speed as the other vessel must keep clear The other vessel must keep her course and speed Both vessels must keep their course and speed"
with difficulty easily without any help without working
keep kept must keep must be kept
may keep may be kept must keep must be kept
keeping, set keep, set set, keep to set, keep
would could keep must keep should keep...