Where should the union jack be flown on a ship?

The union jack should be flown at the jack staff on a ship. The jack staff is a vertical pole located at the bow of the ship, and flying the union jack from this position is a traditional practice that signifies the ship's national identity. This practice is important as it distinguishes the union jack from the national ensign, which is typically flown from the stern of the ship. It is also a symbol of the ship being in port or at anchor when the union jack is displayed. This usage reflects proper naval customs and traditions, ensuring that the flag is displayed appropriately to convey respect and adherence to maritime protocols.