Automatic Radar Plotting Aid – Officer of the Deck Phase (ARPA - OOD) Phase 1 Practice Test

These questions are part of the practice quiz. Start practicing

• With CPA and TCPA limits set to 0.3 nm and 20 minutes, a contact will have a CPA of 0.4 nm in 15 minutes. Will you receive an alarm for this contact?
• When should you delete a target track in ARPA?
• In ARPA tracking, what does extrapolation refer to?
• TRIAL MANEUVER mode can be inaccurate when which condition occurs?
• The vector displayed after 3 minutes of steady state tracking represents which of the following?
• Which inputs are required for sea-stabilized ARPA information?
• According to IMO performance standards, what triggers a warning for a target?
• Which statement is true regarding automatic identification systems (AIS)?
• The radar control most helpful in reducing sea return saturation at close ranges is the...
• Why is continuous situational awareness important even when a target appears stable on ARPA?
• Which data items does AIS provide for validating ARPA tracks?
• The ARPA facilities should be available on at least the following range scales...
• What does increasing bearing rate combined with decreasing range indicate about a target?
• Which practice improves ARPA OOD Phase 1 proficiency at night?
• What should you do if track quality drops due to clutter?
• Gradual alterations of course will help the ARPA process data faster and provide more accurate information. Which of the following is true?
• The ARPA has two guard rings; what is the inner guard ring for?
• If you want the navlines to follow a fixed reference frame aligned with the ground, which stabilization should be used?
• If TCPA is decreasing and CPA is also decreasing, what does this indicate?
• Which statement best describes ARPA's approach to prioritizing targets during close-quarters maneuvering?
• Regarding ARPA data reliability, which statement is true?
• Which factor can cause ARPA data to become unreliable?
• When observing a target's past positions in TM, what information can be quickly gleaned?
• Which warning is required by the IMO performance standards?
• What is the benefit of the history display of past positions on ARPA?
• What inputs does ARPA use to create and maintain a target track?
• A radar display in which the orientation is fixed so that North is always at the top is called a...
• You will get an alarm if you experience target swap in the rain.
• TCPA stands for Time to Closest Point of Approach.
• Which method helps verify a tracked target's identity on ARPA?
• Which of the following is NOT a best practice for ARPA OOD Phase 1 proficiency?
• Which input is not required for sea-stabilized ARPA information?
• If a radar echo is confirmed to be a false target, what is the recommended action?
• If a previously auto-deleted track reappears, what should the operator do?
• To prevent confusion when two tracked targets cross paths, ARPA uses which action?
• What is meant by track correlation in ARPA?
• How often are ARPA tracks typically updated?
• Why is it important to monitor both CPA and TCPA rather than only one?
• Which statement about safe ARPA usage given potential errors is true?
• In navigation, what does 'drift' refer to?
• Which of the following is NOT a required operational warning on ARPA?
• What is a track quality indicator, and why is it important?
• How can you distinguish a real target from a ghost on the radar using ARPA features?
• When ARPAs are used in sea stabilized mode with true tracks, data relating to own ship's motion is fed to the ARPA from the...
• Hooking a contact when it first appears on your radar scope initiates the process for ARPA to track the contact.
• Which data sources should be used to validate ARPA threat data before action?
• What is parallel indexing?
• In navigation terms, which factor is described by 'set'?
• TCPA stands for Time to Closest Point of Approach and indicates:
• You are underway at 10 knots and observe a contact dead ahead that appears to close from 10 miles to 8 miles in 12 minutes. The estimated speed of the contact is:
• Name two common reasons ARPA tracks may be lost or require reassociation.
• When using an ARPA, what should you consider in order to evaluate the information displayed?
• In fog, radar ranges are less accurate.
• When two ARPA-equipped ships collide, which statement is typically true?
• The Navlines displayed on an ARPA will drift under which condition?
• What does the acronym DIW stand for in radar tracking terminology?
• Which radar suppression should be used with heavy cloud cover and storms?
• How can parallel indexing help during a maneuver?
• In restricted visibility, what should you avoid when altering course for a vessel forward of your beam that you cannot see visually?
• According to IMO standards, the ARPA data display should be visible to more than one observer in conditions of light normally experienced on the bridge by day or night.
• Which range scales must ARPA be available on according to IMO requirements?
• In the set and drift example with 145° True at 1.5 knots, what is the displayed set bearing?
• How should ARPA data be used to support decision-making?
• Which set of inputs is essential for calculating relative motion and CPA/TCPA on ARPA?
• Which scenario would trigger an ARPA alarm?
• In a GPS-denied environment, which system is more useful for tracking targets and why?
• How is relative motion used to evaluate collision risk on an ARPA display?
• Ground-stabilized true vectors represent which of the following?
• What is the difference between an 'own ship' track and a 'target' track on ARPA?
• What is a false target, and how should it be handled?
• How should an OOD respond if ARPA reports a high-risk alarm with a nearby TCPA?
• When an ARPA-tracked target maneuvers, the first indication of a maneuver will probably be seen on which feature if your ARPA has it?
• Which feature on ARPA is used to alert when a target enters a predefined perimeter?
• What is the effect of changing the display range scale on ARPA track accuracy?
• Which controls let you reassign a target to a different track without deleting it?
• What is bearing rate, and why is it important?
• What is the function of the inner guard ring on ARPA's two-ring target guard system?
• What is the recommended action if a target suddenly changes course in ARPA?
• To determine the CPA on a contact, one should mark the target at least how many times within a minute?
• What is the effect of reinitializing tracking in ARPA?
• How can ARPA help in congested waterways with multiple targets?
• Which of the following information is least dependent on ARPA processing?
• Which data validation steps should a watchstander perform with ARPA data?
• What does a negative TCPA indicate?
• In the set and drift example with 207° True at 2.2 knots, what is the displayed set bearing?
• If your speed input is incorrect, what effect would it have on your ARPA data?
• Which statement best describes ARPA target swap warnings in rain?
• Which scenario would trigger the Input Lost ARPA alarm?
• In ARPA terminology, what do CPA and TCPA stand for and what do they indicate?
• When validating a potential false target, which cue is most useful?
• Which ARPA/Radar error causes multiple targets to appear on the same bearing at equal spaced ranges?
• A stabilized radar display is defined as one where which orientation remains constant?
• What is the recommended sequence when a potential threat approaches at the limit of detection?
• Which data sources should be used to validate ARPA track in crossing situations?
• What is the primary purpose of re-acquiring a target in ARPA?
• In addition to ARPA information, an ARPA user should take into account which of the following?
• How does sea state or weather affect ARPA performance?
• If a radar contact is directly astern and the range to the contact decreases, what can be inferred about the contact’s speed relative to your vessel?
• Which ARPA feature helps indicate a target's maneuver when present?
• Describe 2 disadvantages of auto acquisition.
• What does a track label or ID on ARPA signify?
• Which orientation is valid for ARPA display in relative motion according to IMO?
• What does a track on ARPA represent?
• Provided a target is not subject to a target swap, the ARPA should continue to track an acquired target that remains clearly distinguishable on the display for how many consecutive scans?
• Which statement about radar performance in fog is supported by the material?
• What does CPA stand for in ARPA?
• Watchstanders can measure error in the ARPA presented information by using which of the following?
• In ARPA operations, what happens when two targets cross and could be confused?
• Which radar control is primarily used to suppress sea clutter at close ranges?
• In the following set and drift example, for a reading of 330° True at 0.7 knots, what is the displayed set bearing?
• Which inputs are required to maintain a North-up, True Motion display?
• On a course-up stabilized ARPA display, what happens to the heading flasher when you change course?
• The closest point of approach (CPA) on a relative motion radar may be determined after what tracking condition?
• Regarding the IMO requirements for past positions, ARPAs can display both true and relative past positions.
• What is the purpose of a track label or ID in ARPA?
• If the CPA/TCPA alarm is continually sounding, what is the recommended action?
• You observe a target visually dead ahead but it is displayed on your radar at 5 degrees to starboard of the heading flash. How would you correct this?
• What is the purpose of lookahead time in ARPA?
• What does set refer to in ARPA set and drift calculations?
• Regarding ARPA errors, which of the following is true?
• TRIAL MANEUVER mode can display inaccurate information under which condition?
• What does bearing rate represent in ARPA tracking inputs?
• The relative motion line (CPA/TCPA) is used to assess collision risk. Which statement best describes its role?
• What is the purpose of VRM and EBL on the radar when using ARPA?
• Which factor contributes to the assessment of the risk of collision?
• Which parameter is NOT used by ARPA to create or maintain a target track?
• In ARPA, the term 'designated range' refers to what?
• Ground stabilized true vectors are intended to represent what?
• What is the difference between true bearing and relative bearing on an ARPA display?
• In crossing situations, how does ARPA data support COLREGS compliance?
• What data should be documented in the watch log when ARPA identifies a potential risk?
• Which indicators provide inputs to ARPA equipment?
• Which practice helps ensure ARPA reliability during a watch?
• In interpreting ARPA data, which approach is recommended to avoid overreliance?
• Is it best to use true vectors or relative vectors to determine a contact's CPA? Why?
• What control would you adjust if known targets were not being detected on your radar?
• What does CBDR signpost in ARPA plotting?
• Which ARPA capability helps manage multiple targets in congested waterways?
• Which general statement concerning radar is NOT true?
• IMO requires ARPA to operate in relative motion with...
• In fog conditions, is it possible for a radar to have a limited effective range?
• What is the difference between automatic ARPA track initiation and manual plotting?
• Which of the following is a common operator error that degrades ARPA performance?
• Under IMO performance standards, when should warnings be issued?
• You will always get an alarm if a target swap occurs.
• Which factor determines how long ARPA waits before issuing a warning?
• If an ARPA must display both true and relative past positions, what does this imply about its track history capability?
• How many guard zones are used on ARPA?
• Which practice best supports ARPA OOD Phase 1 proficiency at night?
• How does ARPA handle multiple targets during close-quarters maneuvering?
• Which factor most directly relates to measurement bias causing a fixed landmark to appear to move on ARPA?
• What is the primary purpose of ARPA on the bridge during watchkeeping?
• When your ship is in a cross current, the Navlines on your ARPA screen will remain stationary, or near stationary, when you operate in...
• What is the purpose of track history on ARPA?
• How can ARPA data be cross-checked with ECDIS/AIS during a watch?
• Which phenomenon can cause a fixed landmark to appear to have non-zero true speed on ARPA?
• You are operating in a sea stabilized display and note a contact has a true course of 090 degrees true with a true speed of 1.1 kts. You know this object is a stationary buoy. What is the set and drift?
• In rain, ARPA performance is affected how?
• Which ARPA indicator helps estimate the time to interaction visually?
• How does ARPA handle data aging and track expiry?
• Describe the purpose of utilizing two guard zones on ARPA.
• According to IMO performance standards, what should an ARPA do to improve the standard of collision avoidance at sea?
• What is the minimum number of targets that an IMO approved ARPA must track simultaneously?
• Which of the following is an IMO ARPA performance standard?
• What is a key objective of the IMO ARPA performance standards?
• Which stabilization method should be used with navlines for navigation?
• What is the purpose of track continuity in ARPA?
• In warning criteria, who determines when to issue a warning?
• Before taking action on a threat, ARPA threat data should be cross-checked with which combination of sources?
• What is the lowest range scale that IMO requires ARPA facilities to be available on?
• Which statement best describes how track quality is affected by data age?
• Which action best supports accurate interpretation when ARPA and visual bearings disagree?
• If CPA is small and TCPA is long, what does that imply?
• According to IMO, log and speed indicators providing inputs to ARPA equipment should be capable of providing...
• A radar contact will remain stationary on a relative motion radar display only when it is...