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ARPA WRITTEN EXAM QUESTIONS WITH SOLVED ANSWERS GRADED A+
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ARPA WRITTEN EXAM QUESTIONS WITH SOLVED ANSWERS GRADED A+
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ARPA WRITTEN EXAM QUESTIONSWITH SOLVED ANSWERS GRADED A+
What control would you adjust if known targets where not being detected on your
radar? Answer - -Gain
-Suppressions
-Range scale
Which of the following contributes to assessment of risk of collision? Answer - -the
relative motion line (CPA/TCPA)
-aspect
-the amount of error in the calculations
A radar contact will remain stationary on a relative motion radar display only when it
is? Answer - on the same course and speed as your vessel
You are underway at 10 kts. At 1800 you note a radar contact dead ahead at a range
of 10 nm. At 1812 the contact is still dead ahead at a range of 8 nm. The estimated
speed of the contact is? Answer - m1 = 10nm
m2 = 8nm
time -12
srm = m1-m2/time
=(10-8)nm/12min
=1/6 nm/mi
=10 nm/hr = 10kts
You are underway at 5kts and see on your radar a contact 10nm directly aster of
you. 12 min later the same contact is 8 miles directly aster of you. What is the
estimated speed of the contact? Answer - m1 = 10nm
m2 = 8nm
time -12
srm = m1-m2/time
=(10-8)nm/12min
=1/6 nm/mi
SRM=10 nm/hr = 10kts
true speed directly astern = SRM +- true speed (upscope = add)
, true speed = 10kts + 5kts = 15kts
The closest point of approach (CPA) of a contact on a relative motion radar may be
determined : Answer - 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 north is always
at the top of the screen is called_________ Answer - North Up Stabilized display
What inputs are required to maintain a north up, true motion display? Answer - -gyro
course
-log speed
In addition to ARPA info, an ARPA user should take into account: Answer - -the
limitations of that info
-rules of the road
-the circumstances of the situation including external considerations
In restricted vis what should you avoid when altering course of a vessel forward of
your beam that you cannot see visually? Answer - Altering course to port EXCEPT in
overtaking situations
When two ARPA equipped ships collide, which of the following is true? Answer -
both vessels are likely to be at fault
When using an ARPA, what should you consider in order to evaluate the info
displayed? Answer - Navigational constraints may require a target vessel to change
course
Which of the following info is most dependent of ARPA? Answer - -the bow crossing
range and bow crossing time date given on a selected target
-range and bearing readout on a "designated" target
-course and speed data of a DIW target
According to IMO, log and speed indicators providing inputs to ARPA equipment
should be capable of providing: Answer - the ship's speed through the water
What is the minimum number of targets that an IMO approved ARPA must track?
Answer - 20
What is the lowest range scale that IMO requires ARPA facilities to be available on?
Answer - 3 miles
According to IMO standards, the ARPA data display: Answer - Should be visible to
more than one observer in conditions of light normally experience on the bridge by
day or night
Regarding the IMO requirements for past positions: Answer - all ARPAs can display
both true and relative past positions
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