AB Navigation & Watchstanding 2

Question 1

When standing a proper lookout at night, which method of viewing is most effective for detecting dim objects?

Accepted Answer

Off-center or peripheral vision slightly away from the object

Answer

At night, rod cells in the peripheral retina are more sensitive to low light, so looking slightly off-center (eccentric viewing) reveals dim objects better than direct central vision.

Question 2

A vessel is required to proceed at a safe speed. Which factor is NOT listed under COLREGS Rule 6 for determining safe speed?

Accepted Answer

The experience level of the helmsman

Answer

COLREGS Rule 6 lists visibility, traffic density, maneuverability, and background lights as factors, but the helmsman's experience level is not included.

Question 3

You are on watch and the vessel's magnetic compass reading differs from the gyrocompass by more than 2 degrees compared to the last logged error. What should you do first?

Accepted Answer

Report the discrepancy to the officer of the watch and note it in the log

Answer

Any significant change in compass error must be reported to the OOW and logged so it can be investigated; the watch officer decides the appropriate action.

Question 4

According to the International Regulations for Preventing Collisions at Sea, a vessel is considered to be 'underway' when she is:

Accepted Answer

Not at anchor, not made fast to shore, and not aground

Answer

COLREGS Rule 3 defines 'underway' as not at anchor, not made fast to shore, and not aground — regardless of whether the vessel is moving.

Question 5

While keeping a radar watch in restricted visibility, you detect a vessel fine on your starboard bow with a steady bearing and decreasing range. According to COLREGS, you should:

Accepted Answer

Reduce speed, stop, or take all way off as necessary

Answer

In restricted visibility, Rule 19 requires reducing speed to bare steerage, stopping, or taking all way off when a close-quarters situation may develop — normal crossing rules do not apply.

(AB) Able Seaman Exam Practice Test

(AB) Able Seaman Exam Practice Test

AB Navigation & Watchstanding 2