Rule 22 Visibility of Lights

(a) In vessels of 50 metres or more in length:

• a masthead light, 6 miles;
• a sidelight, 3 miles;
• a stern light, 3 miles;
• a towing light, 3 miles;
• a white, red, green or yellow all-round light, 3 miles.

(b) In vessels of 12 metres or more in length but less than 50 metres in length:

• a masthead light, 5 miles; except that where the length of the vessel is less than 20 metres, 3 miles;
• a sidelight, 2 miles;
• a sternlight, 2 miles;
• a towing light, 2 miles;
• a white, red, green or yellow all-round light, 2 miles.

(c) In vessels of less than 12 metres in length:

• a masthead light, 2 miles;
• a sidelight, 1 mile;
• a sternlight, 2 miles;
• a towing light, 2 miles;
• a white, red, green or yellow all-round light, 2 miles.

(d) In inconspicuous, partly submerged vessels or objects being towed:

• a white all-round light, 3 miles.