Sound and Light Signals Quiz

What is the arc of visibility of a masthead light?

• 135°

• 225°

• 112.5°

• 360°

Which lights are carried on the port and starboard sides of a vessel?

• White and yellow

• Red and green

• Red and white

• Green and yellow

A sternlight is visible over an arc of how many degrees?

• 225°

• 360°

• 112.5°

• 135°

A yellow towing light has the same characteristics as which other light?

• Masthead light

• Sternlight

• All-round light

• Sidelight

What does one short blast on a whistle mean?

• Vessel is altering course to starboard

• Vessel is altering course to port

• Vessel is going astern

• Vessel is at anchor

What do two short blasts indicate?

• Vessel at anchor

• Vessel altering course to port

• Vessel going astern

• Vessel in restricted visibility

What does three short blasts indicate?

• Vessel altering course to port

• Vessel making way

• Vessel operating astern propulsion

• Vessel not under command

Five short blasts on the whistle mean:

• Vessel at anchor

• Danger signal

• Vessel restricted in ability to maneuver

• Vessel under sail

A power-driven vessel underway in restricted visibility must sound:

• Two prolonged blasts every 2 minutes

• One prolonged blast every 2 minutes

• Three short blasts every 1 minute

• Bell for 5 seconds every 2 minutes

Which vessel shows two all-round red lights in a vertical line?

• Pilot vessel

• Vessel not under command (NUC)

• Vessel engaged in fishing

• Vessel constrained by draught