ARPA Wri en Exam – OOD Ques ons and answers
Newest RATED A+ 2025/2026 NEW!!
What controls would you adjust if known targets were not being detected on your radar?
Gain, suppressions + range scale
What contributes to assessment of risk of collision?
-rela ve mo on line (CPA/TCPA)
-Aspect
-the amount of error in calcula ons
A radar contact will remain sta onary on a rela ve mo on radar display only when it is?
On the same course + speed as your vessel
We have an expert-wri en solu on to this problem!
You are underway at 10 kts. At 1800 you note a radar contact dead ahead at a range of 10 miles.
At 1812 the contact is s ll dead ahead bu at a range of 8 miles. The es mated speed of the
contact is ________.
Dead in the Water (DIW)
You are underway at 5 kts and see on your radar a contact 10 miles directly astern of you. 12
minutes later the same contact is 8 miles directly astern of you. What is the es mated speed of
the contact?
15 kts
The closest point of approach (CPA) of a contact on a rela ve mo on radar may be determined:
a3er the contact has been marked at least twice over a period of at least a minute
A radar display in which the orienta on of the display is fixed so that North is always at the top
of the screen is called a/an
Stabilized display
What inputs are required to maintain a North-Up, True Mo on display?
Gyro course + speed log
, In addi on to ARPA informa on, an ARPA user should take into account
-the limita ons of that informa on
-rules of the road
-circumstances of the situa on including external considera ons
In restricted visibility what should you avoid when altering course for a vessel forward of your
beam that you cannot see visually?
Altering course to port except in overtaking situa ons
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 informa on displayed?
Naviga onal constraints may require a target vessel to change course
What informa on is least dependent of ARPA processing?
EBL/VRM data
According to IMO, log and speed indicators providing inputs to ARPA equipment should be
capable of providing:
the ship's speed through 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 facili es to be available on?
3 miles
According to IMO standards, the ARPA data display:
should be visible to more than 1 observer in condi ons of light normally
Regarding the IMO requirements for past posi ons:
all ARPAs can display both true + rela ve past posi ons
IMO requires ARPA to operate in rela ve mo on with
either north-up, head-up or course-up display
Newest RATED A+ 2025/2026 NEW!!
What controls would you adjust if known targets were not being detected on your radar?
Gain, suppressions + range scale
What contributes to assessment of risk of collision?
-rela ve mo on line (CPA/TCPA)
-Aspect
-the amount of error in calcula ons
A radar contact will remain sta onary on a rela ve mo on radar display only when it is?
On the same course + speed as your vessel
We have an expert-wri en solu on to this problem!
You are underway at 10 kts. At 1800 you note a radar contact dead ahead at a range of 10 miles.
At 1812 the contact is s ll dead ahead bu at a range of 8 miles. The es mated speed of the
contact is ________.
Dead in the Water (DIW)
You are underway at 5 kts and see on your radar a contact 10 miles directly astern of you. 12
minutes later the same contact is 8 miles directly astern of you. What is the es mated speed of
the contact?
15 kts
The closest point of approach (CPA) of a contact on a rela ve mo on radar may be determined:
a3er the contact has been marked at least twice over a period of at least a minute
A radar display in which the orienta on of the display is fixed so that North is always at the top
of the screen is called a/an
Stabilized display
What inputs are required to maintain a North-Up, True Mo on display?
Gyro course + speed log
, In addi on to ARPA informa on, an ARPA user should take into account
-the limita ons of that informa on
-rules of the road
-circumstances of the situa on including external considera ons
In restricted visibility what should you avoid when altering course for a vessel forward of your
beam that you cannot see visually?
Altering course to port except in overtaking situa ons
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 informa on displayed?
Naviga onal constraints may require a target vessel to change course
What informa on is least dependent of ARPA processing?
EBL/VRM data
According to IMO, log and speed indicators providing inputs to ARPA equipment should be
capable of providing:
the ship's speed through 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 facili es to be available on?
3 miles
According to IMO standards, the ARPA data display:
should be visible to more than 1 observer in condi ons of light normally
Regarding the IMO requirements for past posi ons:
all ARPAs can display both true + rela ve past posi ons
IMO requires ARPA to operate in rela ve mo on with
either north-up, head-up or course-up display
