单项选择题
A position obtained by crossing lines of position taken at different times and advanced to a common time is a(n) （）.
A.dead-reckoning position B.running fix C.estimated position D.fix
单项选择题 A position obtained by applying ONLY your vessel’s course and speed to a known position is a （）.
单项选择题 A polyconic projection is based on a （）.
单项选择题 A pilot vessel on pilotage duty at night will show sidelights and a stern light （）.
