What determines if a vessel is "restricted in her ability to maneuver"?

A vessel is considered "restricted in her ability to maneuver" due to the nature of its work. This classification applies to vessels that are engaged in operations that limit their capacity to navigate safely, including tasks such as underwater work, maintenance, dredging, or even vessels engaged in towing. For instance, a dredge may draw its anchor or take on materials from the seabed, which can severely limit its ability to change course or speed.

The definition captures the operational context in which the vessel is working rather than physical attributes like size, weight, or factors such as weather conditions. While weather may certainly affect a vessel's handling capabilities, it does not define the inherent limitations placed on it due to the tasks it is undertaking. The size of the crew on board is also not relevant to whether a vessel's ability to maneuver is restricted; it's rooted in the specific activities being performed. Thus, the nature of the vessel's work is the primary determinant for this designation.