单项选择题
A.the meridian through the object of the bearing
B.the meridian through the ship's position
C.the meridian midway between the ship and the object
D.any meridian
单项选择题 When navigating in high latitudes and using a chart based on a Lambert conformal projection，（）.
单项选择题 When a buoy is in position only during a certain period of the year，where may the dates when the buoy is in position be found?（）
单项选择题 What is NOT an advantage of the rhumb line track over a great circle track? （）