What additional identity lights may a sailing vessel exhibit?

A sailing vessel may exhibit an all-round green light to indicate that it is under sail in addition to its standard navigation lights. This light serves the purpose of informing other vessels that the sailing craft is not using its engine and is reliant on wind power for its movement. The all-round green light is particularly useful at night or in reduced visibility conditions, enhancing the visibility of the sailing vessel and promoting safe navigation among various types of craft.

The function of this light is closely tied to the Colregs (International Regulations for Preventing Collisions at Sea), which stipulate the specific light configurations vessels must display to convey their status effectively. The inclusion of unique identity lights, like the all-round green light, helps in identifying the specific type of vessel and its mode of operation to other mariners, thus contributing to overall navigational safety.

This understanding is essential for officers on watch, as it helps them identify the type of vessel they may encounter and respond appropriately, ensuring safe passage at sea.