Q Flag

Also known as the “Quebec Flag,” is a solid yellow maritime signal flag used to indicate that a vessel is requesting clearance to enter a port and is free of contagious disease.

The Q Flag is a component of maritime communication under the International Code of Signals. Historically, it played a crucial role in quarantine procedures, signalling that a ship was healthy and seeking permission to dock. When approaching a port, a vessel hoists the Q Flag to notify port authorities that it requires clearance for entry. This practice ensures that the ship complies with health and customs regulations before coming into contact with the local population or infrastructure. 

The flag’s yellow colour is highly visible and universally recognised, making it an effective tool for non-verbal communication at sea. In modern times, the Q Flag is less about disease control and more about fulfilling procedural requirements for customs and immigration. However, it remains a vital symbol of maritime tradition and safety. Once the ship has been inspected and granted clearance, the Q Flag is lowered, and the appropriate courtesy flag of the host nation is raised. 

The use of the Q Flag underscores the importance of maintaining order and safety in international waters, facilitating smooth interactions between vessels and port authorities. Its role has evolved with advancements in technology and health protocols, but it remains a timeless emblem of maritime discipline and cooperation.