COLREGS Rule 20-24

Rules in this part shall be complied with in...

• all weathers

• good weathers

• bad weathers

• restricted visibility

Which of the following applies concerning lights?

• complied with from sunset to sunrise

• complied with from sunrise to sunset

The Rules concerning shapes shall be complied with

• by night

• by day

This means a white light placed over the fore-and-aft centreline of the vessel showing an unbroken light over an arc of the horizon of 225° and so fixed as to show the light from right ahead to 22.5° abaft the beam on either side of the vessel.

• stern lights

• side lights

• masthead light

• towing lights

This is showing an unbroken light over an arc of the horizon of 112.5° and so fixed as to show the light from right ahead to 22.5° abaft the beam on its respective side.

• masthead lights

• side lights

• all-round light

• stern light

Means a white light placed as nearly as practicable at the stern showing an unbroken light over an arc of the horizon of 135° and so fixed as to show the light 67.5° from right aft on each side of the vessel.

• masthead light

• side light

• sternlight

• flashing light

This means a yellow light having the same characteristics as the "sternlight"

• towing light

• side light

• flashing light

• masthead light

means a light showing an unbroken light over an arc of the horizon of 360°

• all-round light

• stern light

• flashing light

• side lights

means a light flashing at regular intervals at a frequency of 120 flashes or more per minute

• flashing light

• running light

• side lights

• mast-headlight

In vessels of 50 m or more in length, what is the minimum range of the masthead light?

• 1 mile

• 3 miles

• 6 miles

• 12 miles