When at sea, the ensign is flown from which location on a ship?

The ensign is flown from the mainmast of a ship when it is at sea, as this is the designated location for the national flag. The mainmast is typically the tallest mast on a sailing vessel and provides optimal visibility for the flag, symbolizing national pride and identity. By flying the ensign from this location, it also follows established naval customs and traditions, emphasizing the importance of proper flag protocol. This practice helps maintain consistency across different vessels in the fleet, reinforcing unity and maritime professionalism. Knowing this tradition is crucial for all naval personnel, as it reflects respect for the maritime heritage and command structure.