What term describes the flag flown by ships that indicates their nationality?

The flag that indicates a ship's nationality is referred to as the "Union Flag." This terminology is commonly used in naval contexts, particularly for vessels belonging to the United Kingdom. The primary purpose of this flag is to signify the origin of the ship, which is crucial for recognition on the seas.

The Union Flag is flown from the stern of British warships and serves as a clear identifier of the nation's naval presence. Understanding this concept helps cadets grasp the importance of maritime law and international relations at sea. Ships use flags to communicate a range of messages, but the national flag primarily serves the function of denoting nationality and national pride.

In contrast, the other terms have distinct meanings. The "Jack" is a flag flown at the bow of a ship, often used by naval vessels, signifying specific identities or functions. A "Standard Flag" typically refers to a flag that represents a leader or individual, and a "Garrison Flag" is a large flag flown at military posts. Recognizing these differences enhances cadets' comprehension of naval traditions and the symbolism associated with various flags.