The USS Uncas (SP-689), later designated USS SP-689, was a wooden-hulled civilian motorboat repurposed by the United States Navy for patrol duties during World War I. Built in 1917 by the Greenport Basin and Construction Company located in Greenport, Long Island, New York, the vessel exemplified the common practice of converting private motorboats for military use during the wartime period. The Navy acquired her from her owner, Charles L. Poor of New York City, on June 28, 1917, and she was commissioned on the same day as USS Uncas (SP-689). As a patrol vessel, she was assigned to the 3rd Naval District and was primarily tasked with local patrol operations within the New York City area. Her operational base was Section Base No. 6 at Bath Beach, Brooklyn, where she conducted security and patrol duties to safeguard the harbor and coastal waters during the war. In April 1918, to prevent confusion with a similarly named tug, she was renamed USS SP-689. Her service was characterized by routine patrols along the New York waterfront, contributing to the maritime security efforts during the wartime period. Her presence represented the Navy’s strategic initiative to utilize civilian vessels for patrol and defense purposes amid the heightened threat of enemy submarines and surface raiders. Following the conclusion of World War I, USS SP-689 was decommissioned and returned to her owner on December 31, 1918. Her service, though brief, highlights the importance of civilian vessels in the U.S. Navy’s wartime patrol operations and reflects the maritime maritime adaptability during an era of rapid naval expansion and resourcefulness.

This description has been generated using GPT-4.1-NANO based on the Vessel's wikidata information and then modified by ShipIndex.org staff.