Yard patrol boat

Yard Patrol craft are used by the United States Navy for training and for research purposes.

Following the attack on Pearl Harbor the United States Navy leased California-based tuna boats for the duration of the war or "until victory".

Yard Patrol craft provide realistic, at-sea training in navigation and seamanship for midshipmen at the U.S.

[6] YP 701 is used at the Naval Undersea Warfare Center Division in Keyport, Washington, to measure mobile underwater target and torpedo radiated noise plus ambient water noise conditions; serve as a platform for deployment of suspended, stationary, in-water acoustic targets during on-range torpedo proof and test operations; deployment of countermeasure emulator during torpedo operations; and deployment of oceanographic measurement instrumentation to determine seawater conductivity and temperature at the depth(s) of interest.

Such training is designed to develop within midshipmen the abilities of an Officer-of the Deck, a proficiency in navigation, and a working knowledge of afloat operations.