Barges that are moored in a slip used primarily for mooring purposes are not required to do what?

The correct answer indicates that barges moored in a slip used primarily for mooring purposes are not required to be lighted. This is because, in situations where vessels are not underway or actively involved in navigation, the regulations regarding lighting may be less stringent. In general, vessels that are stationary and not operating on navigable waters do not have the same lighting requirements as those that are moving or operating in traffic.

In this context, the emphasis is on the primary use of the mooring slip. If a barge is simply moored and not engaged in active use or transport, then the need for navigational lights that signal its presence and status becomes less critical. This is often the case for barges that are secured in slips for long-term mooring as opposed to being in transit.

Therefore, the requirement for lighting is relaxed, making it unnecessary for moored barges in such situations to maintain those lights, depending on local regulations and the specific circumstances surrounding each mooring. It's important to note, however, that other factors may present in different scenarios, such as local ordinances or specific mariner practices that could require lighting under certain conditions, reinforcing the idea of ensuring safety and visibility in all maritime operations.