Built in San Francisco in 1888 by Matthew Turner, one of the most prolific and celebrated shipbuilders on the West Coast, the Equator is a wooden two-masted pygmy schooner of exceptional maritime and literary significance. The vessel is internationally renowned for its charter in June 1889 by the acclaimed Scottish author Robert Louis Stevenson. Accompanied by his family, Stevenson sailed the Equator on a historic six-month voyage through the South Seas, visiting the Gilbert Islands, the Marshall Islands, and Samoa. This journey deeply influenced Stevenson's later literary output, serving as the direct inspiration for his collaborative novel The Wrecker and his non-fiction work In the South Seas, thereby securing the schooner's legacy in world literature.

Beyond its literary associations, the Equator represents the adaptable and rugged nature of late 19th-century Pacific merchant vessels. In 1897, the ship was converted to a steam-powered tugboat, beginning a diverse, decades-long career that included service with the United States Coast and Geodetic Survey, the Alaskan cannery fleet, and various Puget Sound towing companies. After being decommissioned, the vessel was grounded as a breakwater at the mouth of the Snohomish River in Everett, Washington, in 1956. Listed on the National Register of Historic Places in 1972, the remains of the Equator serve as a rare, tangible link to the golden age of wooden shipbuilding, the regional maritime economy of the Pacific Northwest, and the global travels of Robert Louis Stevenson.