单项选择题
What provides little or no indication that a vessel is dragging anchor? （）
A.Increasing radar range to a fixed object ahead B.Drift lead with the line leading perpendicular to the centerline C.Vibrations felt by placing a hand on the cable D.Changing bearings to distant fixed objects abeam
单项选择题 What is TRUE when operating in fog and other vessels are detected by radar?（）.
单项选择题 What is TRUE of the history display of a target’s past positions on an ARPA?（）
单项选择题 Vessel required to have an Automatic Radar Plotting Aid must have a device to indicate the（）.
