Navigation Center Website Top Header Banner
Home | LNMs | Nav Rules | AIS | NAIS Data Request | MSI Data Downloads | GPS Constellation Status | GPS Testing | Almanacs | USCG Int'l Ice Patrol | Contact Us | Search
Navigation Rules
Mission Areas
Subscribe / Report (free)
Maritime Information

Print friendly version  
RULE 22: VISIBILITY OF LIGHTS

The lights prescribed in these Rules shall have an intensity as specified in Section 8 [Intl] of Annex I to these [Regulations / Rules] so as to be visible at the following minimum ranges:

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

  • a masthead light, 6 miles;
  • a sidelight, 3 miles;
  • a towing light, 3 miles;
  • a white red, green or yellow all-round light, 3 miles.
  • a special flashing light, 2 miles. [Inld]

(b)     In vessels of 12 meters or more in length but less than 50 meters in length;

  • a masthead light, 5 miles; except that where the length of the vessel is less than 20 meters, 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.
  • a special flashing light, 2 miles. [Inld]

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

  • a masthead light, 2 miles;
  • a sidelight, 1 miles;
  • a towing light, 2 miles;
  • a white red, green or yellow all-round light, 2 miles.
  • a special flashing light, 2 miles. [Inld]

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

  • a white all-round light; 3 miles.

<-- Previous Rule --- Next Rule -->