A towboat over 190 Gross Tons on an international voyage is required to carry what?

For a towboat over 190 Gross Tons on an international voyage, the requirement to carry a daylight signaling lamp is established in maritime regulations. This signaling lamp is crucial for communication during daylight hours at sea, particularly for vessels engaged in towing operations, where visibility and the ability to communicate intentions or distress signals are vital for safety and navigation.

A daylight signaling lamp allows a towboat to signal other vessels or receive signals effectively during conditions where traditional communication methods may not suffice, such as in bright sunlight. This capability is particularly important for ensuring safe passage and avoiding collisions during operations, especially when towing other vessels.

In contrast, although other equipment like flares, life rafts, and radio transmitters are significant for various safety protocols and regulations for vessels at sea, they do not specifically address the requirement for signaling during daylight conditions as effectively as a daylight signaling lamp does for a vessel engaged in towing on an international voyage. Hence, the daylight signaling lamp is the correct and most relevant requirement in this context.