The Frigate US Navy: A Brief History of Hull Classification Symbols

The United States Navy, along with its predecessors the United States Revenue Cutter Service and United States Coast Guard, has used various systems to identify its ships throughout history. One such system is the hull classification symbol, also known as a hull code or hull number.

Prior to the modern system, the Navy used a system of numbers assigned to each ship, which was similar to today's system but not referred to as 'hull codes' or 'hull numbers.' This system, known as the SP/ID numbering sequence, was unified and continuous, with no repeated numbers. Ships could change from an SP number to an ID number or vice versa during their careers without altering their unique numbers.

In order to keep track of its vessels, the Navy assigned unique identifying numbers to them. These numbers were used in conjunction with the ship's name to avoid confusion between similar-named ships. For example, a battleship could be referred to as USS Indiana (Battleship No. 1), while a cruiser could be referred to as USS Olympia (Cruiser No. 6).

The system of hull classification symbols was not universally used until the early 20th century. In 1907, some ships began to be referred to by single-letter or three-letter codes, such as USS Indiana (Battleship No. 1). This system allowed for a simpler way to identify ships and reduced confusion.

The modern hull classification symbol system was instituted on July 17, 1920. Today, the US Navy uses a combination of letters and numbers to identify its vessels by type and individual ship within a type. The system is analogous to the pennant number system used by other navies around the world.

In conclusion, the frigate US Navy has a rich history of hull classification symbols that date back to the 19th century. From the SP/ID numbering sequence to the modern hull classification symbol system, each system has played an important role in identifying and distinguishing between ships in the US Navy's fleet.

Frigate us navy