Section patrol - AbsoluteAstronomy.com

A Section Patrol craft was a civilian vessel registered by the United States Navy

United States Navy

The United States Navy is the naval warfare service branch of the United States Armed Forces and one of the seven uniformed services of the United States. The U.S. Navy is the largest in the world; its battle fleet tonnage is greater than that of the next 13 largest navies combined. The U.S...

for potential service during and shortly after World War I

World War I

World War I , which was predominantly called the World War or the Great War from its occurrence until 1939, and the First World War or World War I thereafter, was a major war centred in Europe that began on 28 July 1914 and lasted until 11 November 1918...

.

In 1916, as the First World War continued abroad, the U.S. Navy began a registry of privately-owned pleasure craft

Pleasure craft

A pleasure craft is a boat used for personal, family, and sometimes sportsmanlike recreation. Typically such watercraft are motorized and are used for holidays, for example on a river, lake, canal or waterway. Pleasure craft are normally kept at a marina...

and yacht

Yacht

A yacht is a recreational boat or ship. The term originated from the Dutch Jacht meaning "hunt". It was originally defined as a light fast sailing vessel used by the Dutch navy to pursue pirates and other transgressors around and into the shallow waters of the Low Countries...

s that were available for patrol service

Patrolling

Patrolling is a military tactic. Small groups or individual units are deployed from a larger formation to achieve a specific objective and then return. The tactic of patrolling may be applied to ground troops, armoured units, naval units, and combat aircraft...

in the event the United States was drawn into the conflict. "Section Patrol" ("SP") numbers were assigned in a series beginning with SP-1 and ultimately extending to well over 4000. As the registration process continued, other types of ships and craft were included for which the "Section Patrol" designation was clearly inappropriate, and these were generally given "Identification" ("ID") numbers in the same series as the "SP"s. In addition, some vessels that were numbered with an "SP" prefix before 1918 later had that prefix changed to "ID". The registry, and the SP/ID number series, was continued at least into the early 1920s, with new numbers being assigned to ships completed or examined after the end of World War I. The latter category included some ships that served in the Navy, without numbers, during 1917-1919.

These SP/ID registry numbers were not U.S. Navy "hull number

Hull number

Hull number is a serial identification number given to a boat or ship. A lower number implies an older vessel. The precise usage varies by country and type....

s", which would not be formally adopted until mid-1920. Many of the ships and craft so numbered had no Navy service, while others that were acquired and employed by the Navy received no numbers. However, like hull numbers, the SP/ID numbers were used for record-keeping purposes and were often painted on the exterior of vessels (especially patrol types) to facilitate identification. They can therefore be considered precursors of the later hull number system

Hull classification symbol

The United States Navy, United States Coast Guard, and United States National Oceanic and Atmospheric Administration use hull classification symbols to identify their ship types and each individual ship within each type...

See also