What will cause the ARPA to emit a visual alarm，audible alarm，or both?（）

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?（）.

A.You should make an ample change to port for a vessel crossing on the starboard bow
B.You should maneuver in ample time if a close-quarters situation is developing
C.You should determine the course and speed of all radar contacts at six minute intervals
D.Long-range scanning will provide early warning of ALL other vessels within the radar's range

单项选择题What is TRUE of the history display of a target’s past positions on an ARPA?（）

A.It provides a graphic display to emphasize which vessel is on a collision course
B.In the true presentation，it provides a quick visual check to determine if a vessel has changed course
C.The display is one of the primary inputs and must be in use when using the trial maneuver capability
D.It provides a graphic display of a target vessel's relative course，speed，and CPA

单项选择题Vessel required to have an Automatic Radar Plotting Aid must have a device to indicate the（）.

A.speed of the vessel over the ground or through the water
B.distance to the next port
C.time of the next navigational satellite pass
D.None of the above

单项选择题To determine if risk of collision exists，a vessel which is fitted with radar must use（）.

A.radar scanning
B.radar plotting
C.compass bearings
D.All of the above