The cyclical movement of the Earth's tides are caused by a combination of the gravitational forces of the sun and moon as well as the shape of the costal region. Unlike simple tide clocks that you can buy in novelty stores, more accurate tide predictions use special data gathered by instruments located at each tide station. The data from these measurements are used to determine the harmonic components which then feed into the mathematical algorithms which predict tides for the future. The end results are tested for accuracy and adjustments are made as necessary.
NOT FOR NAVIGATIONAL PURPOSES. USE AT YOUR OWN RISK.
Tide Graph has US-owned Tide Stations only. An internet connection is required to get the latest tide graph. - See TideGraph.com for a complete list of stations.