Rule 30 - Anchored Vessels and Vessels Aground

A vessel at anchor shall exhibit where it can best be seen:

in the fore part, an all-round white light or one ball;

at or near the stern and at a lower level than the previously mentioned light

More than 50m - aft and forward all around white lights

in the for part, an all around white light or a ball by day
at or near the stern and at a lower level, an all around white light
Lower light is back aft when 2 lights present

100 meters or more in length shall, also use the available working or equivalent lights to illuminate her decks

A vessel Run Aground shall exhibit:
Night - Two all around red lights in a vertical line
Day - Three balls in a vertical line

A vessel of less than 7 meters in length, when at anchor, not in or near a narrow channel, fairway or anchorage, or where other vessels normally navigate, shall not be required to exhibit the lights or shapes defined above

A vessel of less than 12 meters in length, when aground, shall not be required to exhibit the lights or shapes described above

A vessel of less than 20 meters in length, when at anchor in a special anchorage area designated by the Secretary, shall not be required to exhibit the anchor lights and shapes required by this Rule.