NASBLA Navigation Rules & Right of Way 2

Question 1

What lights must a power-driven vessel less than 50 meters in length display when underway at night?

Accepted Answer

Masthead light, sidelights, and a sternlight

Answer

Two masthead lights, sidelights, and a sternlight

Answer

Sidelights and an all-round white light only

Answer

Masthead light and an all-round white light

Question 2

What does three short blasts on a vessel's whistle signal mean when vessels are in sight of each other?

Accepted Answer

My engines are going astern

Answer

I am altering my course to port

Answer

I am unable to maneuver

Answer

Danger — stand clear

Question 3

What sound signal must a vessel at anchor in restricted visibility sound every two minutes?

Accepted Answer

Ring the bell rapidly for about five seconds

Answer

One prolonged blast

Answer

Two short blasts followed by one prolonged blast

Answer

Three short blasts

Question 4

What does a red sidelight on a vessel indicate to an observer?

Accepted Answer

The observer is viewing the vessel's port side

Answer

The observer is viewing the vessel's starboard side

Answer

The vessel is operating in reverse

Answer

The vessel is a sailing vessel

Question 5

Under Rule 19 (Restricted Visibility), what speed must a vessel maintain?

Accepted Answer

A safe speed adapted to the prevailing conditions of restricted visibility

Answer

Dead slow ahead at all times

Answer

No more than 5 knots

Answer

The same speed as in good visibility

Question 6

What is the minimum sounding interval for a power-driven vessel making way in restricted visibility?

Accepted Answer

One prolonged blast at intervals of not more than two minutes

Answer

One prolonged blast at intervals of not more than one minute

Answer

Two short blasts at intervals of not more than two minutes

Answer

One short and one prolonged blast every minute

Question 7

What do sidelights on a vessel indicate regarding the arc of visibility?

Accepted Answer

Each sidelight covers an arc of 112.5 degrees

Answer

Each sidelight covers an arc of 180 degrees

Answer

Each sidelight covers an arc of 135 degrees

Answer

Each sidelight covers an arc of 90 degrees