ARPA Test Review Complete Study Guide 2026 | Latest
Update | Graded A+
1. What type of input is essential for an ARPA to provide sea stabilized
information?
Position input
Speed input
Course input
Heading input
2. Describe how the change in range of a radar contact can indicate its speed.
The speed of a radar contact is constant regardless of time.
The speed of a radar contact is irrelevant to its range.
The speed of a radar contact can be determined by measuring the
decrease in range over a specific time interval.
The speed of a radar contact can only be calculated if it is moving
away.
3. Warning messages are
Conditions requiring immediate corrective action
System response or acknowledgement messages
Conditions requiring time available corrective action
Conditions requiring prompt corrective action
4. What is the measure of radar's capability to display separate contacts close
together at the same range?
, Range Resolution
Bearing Resolution
Bearing Accuracy
Range Accuracy
5. If a vessel is navigating in fog and relies solely on RADAR for collision
avoidance, what precautions should be taken considering the limitations of
RADAR in such conditions?
The vessel can increase speed to navigate faster.
The vessel should turn off the RADAR to avoid confusion.
The vessel should reduce speed and maintain a lookout for visual
cues.
The vessel should rely only on RADAR without any visual checks.
6. Discuss the implications of shared fault in collisions between ARPA equipped
vessels.
Only one vessel is responsible, indicating a failure of the other to
monitor properly.
Neither vessel is at fault, which implies that ARPA systems are infallible.
The fault is determined solely by the speed of the vessels involved.
Both vessels being likely at fault suggests a need for improved
communication and adherence to navigation protocols.
7. Describe the significance of the heading flasher in a Course-up, Stabilized
display when a course change occurs.
The heading flasher indicates the speed of the vessel during a course
change.
The heading flasher only activates when multiple targets are tracked.
, The heading flasher is irrelevant during course changes.
The heading flasher helps the navigator maintain awareness of the
original heading until the new heading is confirmed.
8. What condition must be met for a radar contact to appear stationary on a
relative motion radar display?
Moving in the opposite direction to the observer
Stationary in relation to the earth
Moving at the same speed and direction as the observer
Moving faster than the observer
9. If an ARPA system fails to track multiple targets effectively, what potential risk
does this pose to maritime safety?
Reduced fuel consumption
Enhanced engine performance
Improved navigation accuracy
Increased risk of collision
10. What is a limitation of using RADAR systems in foggy conditions?
Fog enhances RADAR performance.
RADAR systems do not function in fog.
RADAR ranges are less accurate.
RADAR can detect all targets accurately.
11. What is the term used to describe the radar error that results in multiple
targets appearing at the same bearing?
Bearing Displacement Error
, Range Displacement Error
Echo Delay Error
Target Overlap Error
12. What is the typical outcome regarding fault when two ARPA equipped ships
collide?
Neither vessel is likely to be found at fault
Both vessels are likely to be found at fault
One vessel is likely to be found at fault
Only the vessel with the malfunctioning ARPA is at fault
13. What does CPA stand for in the context of radar navigation?
Collision Prevention Algorithm
Course Plotting Analysis
Current Position Assessment
Closest Point of Approach
14. ARPAs fitted with automatic acquisition (guard zone) are required to track at
least _____ targets simultaneously?
50 targets
35 targets
10 targets
20 targets
15. Describe how the inner guard ring contributes to maritime safety in ARPA
systems.
The inner guard ring displays the radar image of the surrounding
Update | Graded A+
1. What type of input is essential for an ARPA to provide sea stabilized
information?
Position input
Speed input
Course input
Heading input
2. Describe how the change in range of a radar contact can indicate its speed.
The speed of a radar contact is constant regardless of time.
The speed of a radar contact is irrelevant to its range.
The speed of a radar contact can be determined by measuring the
decrease in range over a specific time interval.
The speed of a radar contact can only be calculated if it is moving
away.
3. Warning messages are
Conditions requiring immediate corrective action
System response or acknowledgement messages
Conditions requiring time available corrective action
Conditions requiring prompt corrective action
4. What is the measure of radar's capability to display separate contacts close
together at the same range?
, Range Resolution
Bearing Resolution
Bearing Accuracy
Range Accuracy
5. If a vessel is navigating in fog and relies solely on RADAR for collision
avoidance, what precautions should be taken considering the limitations of
RADAR in such conditions?
The vessel can increase speed to navigate faster.
The vessel should turn off the RADAR to avoid confusion.
The vessel should reduce speed and maintain a lookout for visual
cues.
The vessel should rely only on RADAR without any visual checks.
6. Discuss the implications of shared fault in collisions between ARPA equipped
vessels.
Only one vessel is responsible, indicating a failure of the other to
monitor properly.
Neither vessel is at fault, which implies that ARPA systems are infallible.
The fault is determined solely by the speed of the vessels involved.
Both vessels being likely at fault suggests a need for improved
communication and adherence to navigation protocols.
7. Describe the significance of the heading flasher in a Course-up, Stabilized
display when a course change occurs.
The heading flasher indicates the speed of the vessel during a course
change.
The heading flasher only activates when multiple targets are tracked.
, The heading flasher is irrelevant during course changes.
The heading flasher helps the navigator maintain awareness of the
original heading until the new heading is confirmed.
8. What condition must be met for a radar contact to appear stationary on a
relative motion radar display?
Moving in the opposite direction to the observer
Stationary in relation to the earth
Moving at the same speed and direction as the observer
Moving faster than the observer
9. If an ARPA system fails to track multiple targets effectively, what potential risk
does this pose to maritime safety?
Reduced fuel consumption
Enhanced engine performance
Improved navigation accuracy
Increased risk of collision
10. What is a limitation of using RADAR systems in foggy conditions?
Fog enhances RADAR performance.
RADAR systems do not function in fog.
RADAR ranges are less accurate.
RADAR can detect all targets accurately.
11. What is the term used to describe the radar error that results in multiple
targets appearing at the same bearing?
Bearing Displacement Error
, Range Displacement Error
Echo Delay Error
Target Overlap Error
12. What is the typical outcome regarding fault when two ARPA equipped ships
collide?
Neither vessel is likely to be found at fault
Both vessels are likely to be found at fault
One vessel is likely to be found at fault
Only the vessel with the malfunctioning ARPA is at fault
13. What does CPA stand for in the context of radar navigation?
Collision Prevention Algorithm
Course Plotting Analysis
Current Position Assessment
Closest Point of Approach
14. ARPAs fitted with automatic acquisition (guard zone) are required to track at
least _____ targets simultaneously?
50 targets
35 targets
10 targets
20 targets
15. Describe how the inner guard ring contributes to maritime safety in ARPA
systems.
The inner guard ring displays the radar image of the surrounding
