When must signals be repeated according to inland rules?

The requirement to repeat signals while in restricted visibility is rooted in the need for safety and communication clarity when visibility is limited. In such conditions, vessels may not be able to see each other, making sounds and visual signals crucial for navigating safely and preventing collisions. The Inland Navigation Rules specify that all vessels must take additional measures to communicate their presence and actions to ensure that other vessels are aware of their position and intent.

Repeating signals helps to reinforce understanding, especially when visibility might impair the ability to see the original signal. This is especially critical in fog or heavy rain, where sound signals are the primary means of communication.

Other scenarios, such as being anchored, during a maneuver, or when operating a vessel under command, have their own sets of rules for communication, but the specific emphasis on repeating signals applies distinctly during times of restricted visibility, highlighting the increased risk in such situations and the need for clear, unambiguous communication among vessels.