RADAR ARPA EXAM 2026/2027
COMPREHENSIVE TEST BANK - 210 QUESTIONS
Correct Answers & Rationales | Expert Verified | Latest Update
A+ VERIFIED | GUARANTEED PASS
, STUVIA EXAM LIBRARY
EXAMINATION DOCUMENT 2026/2027
Radar ARPA Exam 2026/2027
Comprehensive Test Bank - 200+ Questions with Correct Answers & Rationales
A+ VERIFIED - Expert Verified - Latest Update - Guaranteed Pass
Title: Radar ARPA Exam 2026/2027 - Comprehensive Test Bank - 210 Questions
Focus Areas: Radar theory, ARPA functions, collision avoidance COLREGs, target acquisition,
CPA TCPA, trial maneuver, errors limitations, IMO performance standards, display modes.
INCLUDES:
• 210 Unique Scenario-Based Questions (0% Duplication)
• Balanced A/B/C/D Distribution
• Detailed Rationales 80-100 Words with Yellow Highlight
• IMO MSC.192(79), COLREGs Rules 5-19, STCW Compliant
• CPA/TCPA Calculations, Trial Maneuvers, Guard Zones, Clutter Controls
COMPACT EDITION: 3 Questions Per Page | 60-80 Pages Marketable Format
EXPERT VERIFIED | LATEST UPDATE 2026/2027
TABLE OF CONTENTS
1. Radar Theory & Pulse Characteristics (Q1-Q30) ................................ p.3
2. ARPA Functions & Acquisition (Q31-Q60) ........................................ p.13
3. CPA/TCPA & Collision Avoidance (Q61-Q90) .................................... p.23
4. Trial Maneuver & COLREGs (Q91-Q120) ........................................... p.33
5. Errors, Limitations & Clutter (Q121-Q150) ................................... p.43
6. IMO Standards & Display Modes (Q151-Q180) ................................... p.53
7. Advanced Scenarios & Guard Zones (Q181-Q210) ............................. p.63
8. Answer Key Summary ............................................................ p.71
,[RADAR-ARPA-Q1] Your vessel proceeding at 18kt. MT Sea Horizon 101 detected bearing 007° range
0.5 NM on port bow at 5kt. ARPA shows CPA 0.2NM TCPA 3min. Focus: Radar theory pulse length
resolution
Your vessel proceeding at 18kt. MT Sea Horizon 101 detected bearing 007° range 0.5 NM on
port bow at 5kt. ARPA shows CPA 0.2NM TCPA 3min. With focus on Radar theory pulse length
resolution, which statement is most accurate?
A. Shorter pulse length improves range resolution but reduces max range
B. Longer pulse length improves bearing resolution to 0.5°
C. Pulse length has no effect on minimum detection range
D. PRF directly controls pulse length and beam width
Correct Answer: A
Rationale: Correct because Radar theory pulse length resolution principle states
this. In scenario MT Sea Horizon 101 at 007°/0.5 NM, CPA 0.2NM indicates close-
quarters risk requiring appraisal per COLREGs. IMO standards MSC.192(79) and STCW
specify this behavior. Distractors fail: B misinterprets stabilization/acquisition, C
confuses display or clutter function, D overlooks gyro/log error propagation. Trial
maneuver and true/relative vectors confirm the action. Understanding radar plotting,
relative motion triangle, and COLREGs Rules 5,6,7,8,19 ensures safe collision
avoidance and compliant watchkeeping in restricted visibility and congested waters.
[RADAR-ARPA-Q2] Your vessel proceeding at 18kt. MV Atlantic Pride 102 detected bearing 020°
range 1 NM on stbd bow at 6kt. ARPA shows CPA 0.5NM TCPA 4min. Focus: ARPA functions target
acquisition
Your vessel proceeding at 18kt. MV Atlantic Pride 102 detected bearing 020° range 1 NM on
stbd bow at 6kt. ARPA shows CPA 0.5NM TCPA 4min. With focus on ARPA functions target
acquisition, which statement is most accurate?
A. Auto acquisition allowed everywhere including within 1NM of own ship
B. Manual acquisition requires operator to designate target for processing
C. ARPA must acquire and track at least 20 targets automatically per IMO
D. ARPA cannot track targets beyond 12 NM under any circumstances
Correct Answer: B
Rationale: Correct due to ARPA functions target acquisition fundamentals. With MV
Atlantic Pride 102 bearing 020° range 1 NM, COLREGs and ARPA accuracy criteria
dictate this response. IMO requires 3-min tracking for reliable CPA/TCPA within
0.3NM/0.5min. Option B aligns with performance standards and radar theory. A violates
restricted visibility guidance, C misstates pulse/beam relationships, D incorrectly
limits ARPA range or applies irrelevant controls. Understanding radar plotting,
relative motion triangle, and COLREGs Rules 5,6,7,8,19 ensures safe collision
avoidance and compliant watchkeeping in restricted visibility and congested waters.
[RADAR-ARPA-Q3] Your vessel proceeding at 18kt. MV Ever Summit 103 detected bearing 033° range
1.5 NM on stbd quarter at 7kt. ARPA shows CPA 0.8NM TCPA 5min. Focus: COLREGs Rule 19
restricted visibility
Your vessel proceeding at 18kt. MV Ever Summit 103 detected bearing 033° range 1.5 NM on
stbd quarter at 7kt. ARPA shows CPA 0.8NM TCPA 5min. Under COLREGs Rule 19 restricted
visibility, what collision avoidance action is required?
A. Vessel must alter to port for vessel forward of beam in restricted visibility
B. Sounder fog signals exempt you from taking avoiding action
C. Avoid altering to port for vessel forward of beam; avoid altering toward abeam vessel
D. Rule 19 allows stand-on vessel to maintain course regardless of CPA
Correct Answer: C
Rationale: Correct as per COLREGs Rule 19 restricted visibility and IMO performance.
Scenario 033°/1.5 NM CPA 0.8NM requires operator understanding of acquisition, guard
zones and past positions. Manual acquisition needs designation, past dots indicate
maneuver, STC/FTC mitigate clutter. Option C reflects proper procedure. A assumes
auto-acquisition everywhere which is unsafe, B exaggerates tracked target numbers, D
misapplies true/relative or Doppler principles in marine non-coherent radar.
Understanding radar plotting, relative motion triangle, and COLREGs Rules 5,6,7,8,19
ensures safe collision avoidance and compliant watchkeeping in restricted visibility
and congested waters.
Page 3 | Radar ARPA Exam 2026/2027 - Comprehensive Test Bank | Expert Verified
, Radar ARPA Exam 2026/2027 - Questions 4 - 6
[RADAR-ARPA-Q4] Your vessel proceeding at 18kt. MT Nordic Star 104 detected bearing 046° range
2 NM on port quarter at 8kt. ARPA shows CPA 1.1NM TCPA 6min. Focus: CPA TCPA calculation
Your vessel proceeding at 18kt. MT Nordic Star 104 detected bearing 046° range 2 NM on port
quarter at 8kt. ARPA shows CPA 1.1NM TCPA 6min. Regarding CPA TCPA calculation, what is the
correct action and interpretation?
A. TCPA is irrelevant if CPA > 2 NM
B. CPA measured from bow; TCPA measured from stern
C. CPA increases when bearing rate decreases
D. CPA = closest distance between vessels; TCPA = time until that occurs calculated from
relative motion triangle
Correct Answer: D
Rationale: Correct interpretation of CPA TCPA calculation in this encounter. MT
Nordic Star 104 at 046°/2 NM TCPA 6min demands assessment of errors like second
trace, side lobe, indirect echoes and target swap when gates merge. IMO requires
ground/water speed awareness. Option D captures accurate limitation or mode
characteristic. A presumes error-free operation, B misuses pulse vs bearing
resolution, C incorrectly fixes minimum range or suggests ARPA auto-compensates
multipath fully. Understanding radar plotting, relative motion triangle, and COLREGs
Rules 5,6,7,8,19 ensures safe collision avoidance and compliant watchkeeping in
restricted visibility and congested waters.
[RADAR-ARPA-Q5] Your vessel proceeding at 18kt. FV Ocean Harvest 105 detected bearing 059°
range 3 NM on port bow at 9kt. ARPA shows CPA 1.4NM TCPA 7min. Focus: Trial maneuver execution
Your vessel proceeding at 18kt. FV Ocean Harvest 105 detected bearing 059° range 3 NM on
port bow at 9kt. ARPA shows CPA 1.4NM TCPA 7min. For Trial maneuver execution, which trial
maneuver outcome ensures safe passing per COLREGs?
A. Trial simulates own ship course/speed change to predict new CPA/TCPA without
executing
B. Trial maneuver shows true result only after execution
C. Trial maneuver disables ARPA tracking during simulation
D. Trial maneuver can only be performed in true motion north-up
Correct Answer: A
Rationale: Correct because Trial maneuver execution principle states this. In
scenario FV Ocean Harvest 105 at 059°/3 NM, CPA 1.4NM indicates close-quarters risk
requiring appraisal per COLREGs. IMO standards MSC.192(79) and STCW specify this
behavior. Distractors fail: B misinterprets stabilization/acquisition, C confuses
display or clutter function, D overlooks gyro/log error propagation. Trial maneuver
and true/relative vectors confirm the action. Understanding radar plotting, relative
motion triangle, and COLREGs Rules 5,6,7,8,19 ensures safe collision avoidance and
compliant watchkeeping in restricted visibility and congested waters.
[RADAR-ARPA-Q6] Your vessel proceeding at 18kt. MV Pacific Voyager 106 detected bearing 072°
range 4 NM on stbd bow at 10kt. ARPA shows CPA 1.7NM TCPA 8min. Focus: Radar errors and
limitations
Your vessel proceeding at 18kt. MV Pacific Voyager 106 detected bearing 072° range 4 NM on
stbd bow at 10kt. ARPA shows CPA 1.7NM TCPA 8min. With focus on Radar errors and
limitations, which statement is most accurate?
A. Radar is error-free when gyro and log inputs are correct
B. Common errors include side lobe, second trace, indirect echoes, and target glint
C. Range error only occurs due to PRF interference
D. ARPA compensates for all multipath errors automatically
Correct Answer: B
Rationale: Correct due to Radar errors and limitations fundamentals. With MV Pacific
Voyager 106 bearing 072° range 4 NM, COLREGs and ARPA accuracy criteria dictate this
response. IMO requires 3-min tracking for reliable CPA/TCPA within 0.3NM/0.5min.
Option B aligns with performance standards and radar theory. A violates restricted
visibility guidance, C misstates pulse/beam relationships, D incorrectly limits ARPA
range or applies irrelevant controls. Understanding radar plotting, relative motion
triangle, and COLREGs Rules 5,6,7,8,19 ensures safe collision avoidance and compliant
watchkeeping in restricted visibility and congested waters.
Page 4 | Radar ARPA Exam 2026/2027 - Comprehensive Test Bank | Expert Verified
COMPREHENSIVE TEST BANK - 210 QUESTIONS
Correct Answers & Rationales | Expert Verified | Latest Update
A+ VERIFIED | GUARANTEED PASS
, STUVIA EXAM LIBRARY
EXAMINATION DOCUMENT 2026/2027
Radar ARPA Exam 2026/2027
Comprehensive Test Bank - 200+ Questions with Correct Answers & Rationales
A+ VERIFIED - Expert Verified - Latest Update - Guaranteed Pass
Title: Radar ARPA Exam 2026/2027 - Comprehensive Test Bank - 210 Questions
Focus Areas: Radar theory, ARPA functions, collision avoidance COLREGs, target acquisition,
CPA TCPA, trial maneuver, errors limitations, IMO performance standards, display modes.
INCLUDES:
• 210 Unique Scenario-Based Questions (0% Duplication)
• Balanced A/B/C/D Distribution
• Detailed Rationales 80-100 Words with Yellow Highlight
• IMO MSC.192(79), COLREGs Rules 5-19, STCW Compliant
• CPA/TCPA Calculations, Trial Maneuvers, Guard Zones, Clutter Controls
COMPACT EDITION: 3 Questions Per Page | 60-80 Pages Marketable Format
EXPERT VERIFIED | LATEST UPDATE 2026/2027
TABLE OF CONTENTS
1. Radar Theory & Pulse Characteristics (Q1-Q30) ................................ p.3
2. ARPA Functions & Acquisition (Q31-Q60) ........................................ p.13
3. CPA/TCPA & Collision Avoidance (Q61-Q90) .................................... p.23
4. Trial Maneuver & COLREGs (Q91-Q120) ........................................... p.33
5. Errors, Limitations & Clutter (Q121-Q150) ................................... p.43
6. IMO Standards & Display Modes (Q151-Q180) ................................... p.53
7. Advanced Scenarios & Guard Zones (Q181-Q210) ............................. p.63
8. Answer Key Summary ............................................................ p.71
,[RADAR-ARPA-Q1] Your vessel proceeding at 18kt. MT Sea Horizon 101 detected bearing 007° range
0.5 NM on port bow at 5kt. ARPA shows CPA 0.2NM TCPA 3min. Focus: Radar theory pulse length
resolution
Your vessel proceeding at 18kt. MT Sea Horizon 101 detected bearing 007° range 0.5 NM on
port bow at 5kt. ARPA shows CPA 0.2NM TCPA 3min. With focus on Radar theory pulse length
resolution, which statement is most accurate?
A. Shorter pulse length improves range resolution but reduces max range
B. Longer pulse length improves bearing resolution to 0.5°
C. Pulse length has no effect on minimum detection range
D. PRF directly controls pulse length and beam width
Correct Answer: A
Rationale: Correct because Radar theory pulse length resolution principle states
this. In scenario MT Sea Horizon 101 at 007°/0.5 NM, CPA 0.2NM indicates close-
quarters risk requiring appraisal per COLREGs. IMO standards MSC.192(79) and STCW
specify this behavior. Distractors fail: B misinterprets stabilization/acquisition, C
confuses display or clutter function, D overlooks gyro/log error propagation. Trial
maneuver and true/relative vectors confirm the action. Understanding radar plotting,
relative motion triangle, and COLREGs Rules 5,6,7,8,19 ensures safe collision
avoidance and compliant watchkeeping in restricted visibility and congested waters.
[RADAR-ARPA-Q2] Your vessel proceeding at 18kt. MV Atlantic Pride 102 detected bearing 020°
range 1 NM on stbd bow at 6kt. ARPA shows CPA 0.5NM TCPA 4min. Focus: ARPA functions target
acquisition
Your vessel proceeding at 18kt. MV Atlantic Pride 102 detected bearing 020° range 1 NM on
stbd bow at 6kt. ARPA shows CPA 0.5NM TCPA 4min. With focus on ARPA functions target
acquisition, which statement is most accurate?
A. Auto acquisition allowed everywhere including within 1NM of own ship
B. Manual acquisition requires operator to designate target for processing
C. ARPA must acquire and track at least 20 targets automatically per IMO
D. ARPA cannot track targets beyond 12 NM under any circumstances
Correct Answer: B
Rationale: Correct due to ARPA functions target acquisition fundamentals. With MV
Atlantic Pride 102 bearing 020° range 1 NM, COLREGs and ARPA accuracy criteria
dictate this response. IMO requires 3-min tracking for reliable CPA/TCPA within
0.3NM/0.5min. Option B aligns with performance standards and radar theory. A violates
restricted visibility guidance, C misstates pulse/beam relationships, D incorrectly
limits ARPA range or applies irrelevant controls. Understanding radar plotting,
relative motion triangle, and COLREGs Rules 5,6,7,8,19 ensures safe collision
avoidance and compliant watchkeeping in restricted visibility and congested waters.
[RADAR-ARPA-Q3] Your vessel proceeding at 18kt. MV Ever Summit 103 detected bearing 033° range
1.5 NM on stbd quarter at 7kt. ARPA shows CPA 0.8NM TCPA 5min. Focus: COLREGs Rule 19
restricted visibility
Your vessel proceeding at 18kt. MV Ever Summit 103 detected bearing 033° range 1.5 NM on
stbd quarter at 7kt. ARPA shows CPA 0.8NM TCPA 5min. Under COLREGs Rule 19 restricted
visibility, what collision avoidance action is required?
A. Vessel must alter to port for vessel forward of beam in restricted visibility
B. Sounder fog signals exempt you from taking avoiding action
C. Avoid altering to port for vessel forward of beam; avoid altering toward abeam vessel
D. Rule 19 allows stand-on vessel to maintain course regardless of CPA
Correct Answer: C
Rationale: Correct as per COLREGs Rule 19 restricted visibility and IMO performance.
Scenario 033°/1.5 NM CPA 0.8NM requires operator understanding of acquisition, guard
zones and past positions. Manual acquisition needs designation, past dots indicate
maneuver, STC/FTC mitigate clutter. Option C reflects proper procedure. A assumes
auto-acquisition everywhere which is unsafe, B exaggerates tracked target numbers, D
misapplies true/relative or Doppler principles in marine non-coherent radar.
Understanding radar plotting, relative motion triangle, and COLREGs Rules 5,6,7,8,19
ensures safe collision avoidance and compliant watchkeeping in restricted visibility
and congested waters.
Page 3 | Radar ARPA Exam 2026/2027 - Comprehensive Test Bank | Expert Verified
, Radar ARPA Exam 2026/2027 - Questions 4 - 6
[RADAR-ARPA-Q4] Your vessel proceeding at 18kt. MT Nordic Star 104 detected bearing 046° range
2 NM on port quarter at 8kt. ARPA shows CPA 1.1NM TCPA 6min. Focus: CPA TCPA calculation
Your vessel proceeding at 18kt. MT Nordic Star 104 detected bearing 046° range 2 NM on port
quarter at 8kt. ARPA shows CPA 1.1NM TCPA 6min. Regarding CPA TCPA calculation, what is the
correct action and interpretation?
A. TCPA is irrelevant if CPA > 2 NM
B. CPA measured from bow; TCPA measured from stern
C. CPA increases when bearing rate decreases
D. CPA = closest distance between vessels; TCPA = time until that occurs calculated from
relative motion triangle
Correct Answer: D
Rationale: Correct interpretation of CPA TCPA calculation in this encounter. MT
Nordic Star 104 at 046°/2 NM TCPA 6min demands assessment of errors like second
trace, side lobe, indirect echoes and target swap when gates merge. IMO requires
ground/water speed awareness. Option D captures accurate limitation or mode
characteristic. A presumes error-free operation, B misuses pulse vs bearing
resolution, C incorrectly fixes minimum range or suggests ARPA auto-compensates
multipath fully. Understanding radar plotting, relative motion triangle, and COLREGs
Rules 5,6,7,8,19 ensures safe collision avoidance and compliant watchkeeping in
restricted visibility and congested waters.
[RADAR-ARPA-Q5] Your vessel proceeding at 18kt. FV Ocean Harvest 105 detected bearing 059°
range 3 NM on port bow at 9kt. ARPA shows CPA 1.4NM TCPA 7min. Focus: Trial maneuver execution
Your vessel proceeding at 18kt. FV Ocean Harvest 105 detected bearing 059° range 3 NM on
port bow at 9kt. ARPA shows CPA 1.4NM TCPA 7min. For Trial maneuver execution, which trial
maneuver outcome ensures safe passing per COLREGs?
A. Trial simulates own ship course/speed change to predict new CPA/TCPA without
executing
B. Trial maneuver shows true result only after execution
C. Trial maneuver disables ARPA tracking during simulation
D. Trial maneuver can only be performed in true motion north-up
Correct Answer: A
Rationale: Correct because Trial maneuver execution principle states this. In
scenario FV Ocean Harvest 105 at 059°/3 NM, CPA 1.4NM indicates close-quarters risk
requiring appraisal per COLREGs. IMO standards MSC.192(79) and STCW specify this
behavior. Distractors fail: B misinterprets stabilization/acquisition, C confuses
display or clutter function, D overlooks gyro/log error propagation. Trial maneuver
and true/relative vectors confirm the action. Understanding radar plotting, relative
motion triangle, and COLREGs Rules 5,6,7,8,19 ensures safe collision avoidance and
compliant watchkeeping in restricted visibility and congested waters.
[RADAR-ARPA-Q6] Your vessel proceeding at 18kt. MV Pacific Voyager 106 detected bearing 072°
range 4 NM on stbd bow at 10kt. ARPA shows CPA 1.7NM TCPA 8min. Focus: Radar errors and
limitations
Your vessel proceeding at 18kt. MV Pacific Voyager 106 detected bearing 072° range 4 NM on
stbd bow at 10kt. ARPA shows CPA 1.7NM TCPA 8min. With focus on Radar errors and
limitations, which statement is most accurate?
A. Radar is error-free when gyro and log inputs are correct
B. Common errors include side lobe, second trace, indirect echoes, and target glint
C. Range error only occurs due to PRF interference
D. ARPA compensates for all multipath errors automatically
Correct Answer: B
Rationale: Correct due to Radar errors and limitations fundamentals. With MV Pacific
Voyager 106 bearing 072° range 4 NM, COLREGs and ARPA accuracy criteria dictate this
response. IMO requires 3-min tracking for reliable CPA/TCPA within 0.3NM/0.5min.
Option B aligns with performance standards and radar theory. A violates restricted
visibility guidance, C misstates pulse/beam relationships, D incorrectly limits ARPA
range or applies irrelevant controls. Understanding radar plotting, relative motion
triangle, and COLREGs Rules 5,6,7,8,19 ensures safe collision avoidance and compliant
watchkeeping in restricted visibility and congested waters.
Page 4 | Radar ARPA Exam 2026/2027 - Comprehensive Test Bank | Expert Verified
