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The appropriate lights may also be displayed during the day at times of restricted visibility or other necessary circumstances. [3] Vessels under 7 meters are generally not required to display day shapes even if they are required to display lights at night. [4] A square black flag displayed over the ball may be used as a distress signal. [5]
A Morse code light is light in which appearances of light of two clearly different durations (dots and dashes) are grouped to represent a character or characters in the Morse Code. For example, "Mo(A)" is a light in which in each period light is shown for a short period (dot) followed by a long period (dash), the Morse Code for "A".
Schedule K is a geographic coding scheme originally developed by the United States Maritime Administration and currently maintained by the United States Army Corps of Engineers to identify seaports handling waterborne shipments involved with foreign trade of the United States.
Diagram of cardinal marks as seen during the day, with their light patterns. The lights shown here are configured as "Quick". A cardinal mark is a sea mark (a buoy or other floating or fixed structure) commonly used in maritime pilotage to indicate the position of a hazard and the direction of safe water.
Watercraft navigation lights must permit other vessels to determine the type and relative angle of a vessel, and thus decide if there is a danger of collision. In general, sailing vessels are required to carry a green light that shines from dead ahead to 2 points (22 + 1 ⁄ 2 °) abaft [note 1] the beam on the starboard side (the right side from the perspective of someone on board facing ...
The shape is an important feature, as colours cannot be distinguished in some light conditions, or by persons with red-green colour blindness. Marks may also carry unique markings of letters and numbers; these may be used to identify the mark as one indicated on a nautical chart .
List of Lights issued by the US Coast Guard. List of lights and radio signals, sometimes including Fog Signals are provided by government authorities and hydrographic offices for mariners. The lists include prominent lights, such as lighthouses and radio stations that are used in passage planning for navigation and communication while on voyage.
The Naval Vessel Register maintains an online database of U.S. Navy ships. The 1975 ship reclassification of cruisers, frigates, and ocean escorts brought U.S. Navy classifications into line with other nations' classifications, and eliminated the perceived "cruiser gap" with the Soviet Navy .