(MB: dp. 12.5'; 1. 60'; b. 12'6"; dr: 3'6" (aft); s. 10 mph.; cpl. 9 a. 1 1-pdr., 1 mg.)
Audunn (SP-451)—a motorboat built in 1911 at Morris Heights N.Y., by the New York Yacht, Launch & Engine Co.—was purchased by the Navy from M. C. Kimball, New York City, 01 30 June 1917 and was placed in commission there on 5 Novembei 1917, Ens. Charles Laufer, USNRF, in command.
From commissioning to May 1918, the motorboat patrolled the coastal waters of the 3d Naval District. In May 1918, she moved to the Great Lakes and spent the remainder of World War I ir the 9th Naval District, operating out of Detroit, Mich. In November 1918, Audurin returned to New York and resumed duty in the 3d Naval District. She continued that service until 27 March
1919 when she was decommissioned and transferred to the Coast & Geodetic Survey. Her name was struck from the Navy list that same day.