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ARPA Test (2024) Quizzes & Ans!
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ARPA Test (2024) Quizzes & Ans!What controls would you adjust if known targets we're not being detected on your
radar?
- Gain, suppressions, range scale
Which of the following contributes to assessment of risk of collision?
- The relative motion line (CPA/TCPA), aspect, the amount of error in calculations
A radar contact will remain stationary on a relative motion radar display only
when it is?
- On the same course and speed is your vessel.
You are under way at 10 knots. At 1800 you note a radar contact dead ahead at a
range of 10 miles. At 1812 the contact is still dead ahead but at a range of eight
miles. The estimated speed of the contact is?
- Dead in the water (DIW)
You are underway at 5 knots in C on your radar a contact Tim miles directly
astern of you. 12 minutes later the same contact is at 8 miles directly astern a
few. What is the estimated speed of the contact?
- 15 knots
The closest point of approach (CPA) of a contact on a relative motion radar may
be determined:
- after the contact has been marked at least twice over a period of at least a minute.
A radar display in which the orientation of the display is fixed so that the north is
always at the top of the screen is called a/an?
Stabilize Display
What are the inputs to maintain a northup, true motion display?
- gyro course and log speed
In addition to ARPA information, an ARPA user should take into account:
- The limitation is the information, rules of the road, the circumstances of the situation
including external considerations.
In restricted visibility what should you avoid when altering course for a vessel
forward your beam that you cannot see visually?
- Altering course to port except in overtaking situations.
when two ARPA equipped ships collide, which of the following is typically true?
- both vessels are likely to be found at fault.
When using an ARPA, what should you consider in order to evaluate the
information displayed?
- Navigational constraints may require a target vessel to change course.
Which of the following information is least dependent on ARPA processing?
- EBL/ VRM lines
According to IMO, log in speed indicators providing inputs to ARPA equipment
should be capable of providing:
- the ship speed through the water
what is the minimum number of targets that an IMO approved ARPA must track
simultaneously?
20
, What is the lowest range scale that IMO requires ARPA facilities to be available
on?
3 miles
According to IMO standards, the ARPA data display:
regarding the IMO requirements for past positions:
- all ARPA's can display both true and relative past positions
IMO requires ARPA to operate in relative motion with:
- North up, and course up displays.
According to IMO performance standards, what should an ARPA do to improve
the standard of collision avoidance at sea? [IMO Performance standards for
ARPA 1.1.1]
- ARPA Should reduce the workload of observers by automatically providing
information.
The ARPA facilities should be available on at least the following range scales:
- Three or four miles and 12 or 16 miles
List two conditions needed for +/- Steady state tracking.
Both Ships (you and target) must maintain Speed and course
Which of the following is not a required operational warning on ARPA?
- Automatically Acquired Target
The NAV lines displayed on an ARPA:
Will drift when ARPA is sea-stabilized
T/F: Gradual alterations of course will help the ARPA Process data faster and
provide more accurate information.
- False. The moment you change course or speed tracking is thrown off.
When observing a target's past position in TM what information can be quickly
gleaned?
- Target has changed course.
Watchstanders can measure error in the ARPA presented to information by
using:
- A plotting sheet or grease pencil plot on a reflection plotter.
You observe a target visually dead ahead but it is displayed on your radar at 5
degrees to starboard of the heading flash. How could you correct this?
-Check the scanner for antenna misalignment.
When an ARPA-tracked target maneuvers:
- First indication of a maneuver will probably be seen on a persistence or afterglow
feature if your ARPA has one
Regarding ARPA errors, which of the following is true?
-relying on ARPA information can be dangerous unless the user understands the
system well enough to evaluate its limits.
The vector displayed after three minutes of steady state tracking:
-Represents the targets probable past projected into the future.
when operating a radar in fog, is it possible to have a limited effective range?
- True, fog can limit radar but it is minimal.
Which general statement concerning radar is not true?
- The ability of radar to detect objects is unaffected by weather conditions.
When operating a radar in fog radar ranges are less accurate?
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