All Tide Clocks are geared to track only the Atlantic's Tidal changes. The Tide and Time clocks are geared with dual mechanisms to both time and tides. All coastal area's along the Atlantic have different times the tides changes due to Geographical areas. Tide clocks are used to track your specific tidal location. If mounted on a boat or vessel it can be used for the best fishing times or launching or ramping your boat. Coastal tidal area's can track the tide changes on Nor’easters, Hurricane flood surges and tropical storms.