Where is the national flag primarily flown on a naval vessel?

The national flag is primarily flown at the masthead on a naval vessel. The masthead, located at the highest point of the ship's mast, is the most prominent and traditional place to display the national ensign when the ship is at sea. This positioning ensures that the flag is visible from a distance, demonstrating the ship's nationality and serving as a symbol of pride and recognition.

Other locations such as the bridge or the fantail may have flags displayed, but they are not designated as the primary location for the national flag. The galley, being an area intended for food preparation, is not an appropriate place for hoisting the national ensign. Thus, the masthead serves as the correct and most accepted location for displaying the national flag on naval vessels.