The Martinique Time & Tide Clock provides clear, combined time and tide information in a classic brass design. It is an essential instrument for boaters navigating the eastern seaboard of the United States. Combination quartz time and tide movement averaging the lunar tide cycle Tide sector calibrated specifically for the U.S. East Coast for practical use Highly visible red tide hand for quick reading of tide status at a glance Solid brass construction with an easy-to-read 4" dial and compact depth Includes AA battery, complete instructions, and mounting hardware Limited, non-transferable lifetime warranty for long-term confidence Install this dependable time and tide clock on board or dockside for professional-level awareness of changing conditions.