单项选择题
A line of position is（）.
A.a line connecting two charted objects B.a line on some point of which the vessel may be presumed to be located C.the position of your vessel D.not used in a running fix
单项选择题 A line connecting all possible positions of your vessel at any given time is a（）.
单项选择题 A large navigational buoy (LNB) is painted（）.
单项选择题 A fairly accurate estimation of a ship’s position can be calculated by a technique known as（）.
