A.Land first sighted when vessel approaching from seaward B.Land last sighted when vessel leaving from a port C.in sight of one another when vessel underway D.in sight of an island during a ship on her voyage
A.there are no other vessels around B.operating in a narrow channel C.the Master enters it in the ship's log D.necessary to avoid immediate danger
A.ascending the river B.descending the river C.crossing the river D.proceeding towards sea