Navigation lights and signals tell other vessels not only where you are, but what you are doing. Using these lights and signals properly is an important part of safe navigation.
The following diagrams show some of the navigation lights and shapes exhibited by fishing vessels less than 20 metres in length.
(Note : a vessel that is "underway" is one that is not anchored, made fast to shore, or aground.)
A power-driven fishing vessel not engaged in fishing when underway. (Fishing vessels of less than 12 metres in length may, in lieu of these lights, exhibit an all-round white light and sidelights).
A vessel at anchor.