單項選擇題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


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1.單項選擇題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

2.單項選擇題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

3.單項選擇題The shoreline along Rocky Point should give a good radar return because（）.

A.the shore is bluff and rocky
B.of offshore exposed rocks
C.submerged reefs cause prominent breakers
D.the lookout tower is marked with radar reflectors

4.單項選擇題The radio waves used for radar are very short，only（）long.

A.a few centimeters
B.a few fathoms
C.a few meters
D.a few feet

5.單項選擇題The radar control used to reduce sea return at close ranges is the（）.

A.gain control
B.sensitivity time control
C.fast time constant
D.pulse length control