Extremely practical, the Trident Time and Tide Clock is a dual-purpose tool no boating enthusiast or sailor should be without. This smart and practical buy includes combination precision German quartz and tide clock movement that averages the lunar cycle. The tide sector has been calibrated for the East Coast of the United States, although it will work for other bodies of water; it simply requires more frequent re-setting. Part of the Trident Collection, this compact instrument features a polished brass case that has been flawlessly lacquered for long-lasting shine. It comes complete with mounting hardware and instructions, and is backed by a manufacturer"s lifetime warranty. About Weems & Plath Founded in 1928, Weems & Plath is a company steeped in the rich tradition of navigation. They offer a wide spectrum of precision instruments ranging from brass nautical clocks and barometers to binoculars and children"s books. The company"s dedication to providing the highest quality possible is evident in every step of the building process. From development to production, Weems & Plath strives to be meticulous and offer exceptional service. The rich history and high standards of Weems & Plath will carry on into the future. * Polished brass lacquered case * Precision German movement * This clock"s tide accuracy is available only in East Coast locations. It is suitable for decorative purposes in other locations.