Which statement is TRUE concerning a "vessel engaged in fishing"?

A vessel engaged in fishing is characterized by its use of various equipment and methods to catch fish. One of the hallmarks of fishing vessels is that they often employ nets, lines, or trawls as their primary tools for catching fish. This involves actively using gear designed for fishing, which is why the statement regarding the use of nets, lines, or trawls is true.

While it is also possible for fishing vessels to use ropes for specific purposes, such as securing or hauling gear, it is not a defining characteristic of being "engaged in fishing." The requirements to remain in a single position or to display a specific signal could vary based on the type of fishing and the laws in a given area, making those statements less universally applicable in this context.