XTide vs Tides and Currents

XTide provides tide and current predictions. The Apple Watch app and Widget show information for the closest of your favorite tide stations. It is based on the popular open source XTide for Unix from http://www.flaterco.com/xtide/introduction.html XTide includes a harmonics file (tide data) for the United States only due to legal issues with the data from other countries, but supports custom harmonics files. See https://flaterco.com/xtide/faq.html#60 for more information. NOT FOR NAVIGATION This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. The author assumes no liability for damages arising from use of this program OR of any 'harmonics data' that might be distributed with it. For details, see the appended GNU General Public License. (Accurate tide predictions can only be made if the 'harmonics data' for the relevant location are good. Unfortunately, the only way the maintainer of those data has of knowing when they are bad is when someone with access to authoritative tide predictions or observations reports a problem. You should not use this program or any data files that might be distributed with it if anyone or anything could come to harm as a result of an incorrect tide prediction. NOAA and similar agencies in other countries can provide you with certified tide predictions if that is what you need.) XTide's predictions do not incorporate the effects of tropical storms, El Niño, seismic events, subsidence, uplift, or changes in global sea level.

Tides and Currents provide 1343 harmonic tide stations,2199 subordinate tide stations and 849 harmonic current stations, 1707 subordinate current stations of USA. This app predicts tides and currents by using harmonic analysis calculations with Harmonic Constituents which can be get from NOAA website. So the APP can provide tide and current data without network。 Since calculations are performed locally on the device, tide and current data can be viewed for any date. In addition, the APP also provides sunrise,sunset, moonrise , moonset, dusk,dawn, moon phase of every day. In addition, the app provide tide map forecast. Disclaimer: The App loads astronomical tide level and tidal current data, which does not include changes in water levels and residual currents caused by meteorological or other factors. Under special circumstances, the impact of hurricanes, cold waves, floods and other factors should also be considered. Do not use Tides and Currents for navigation purpose or any other purpose that may result in personal injury or property damage. 【Pro】 1.No limit date for tides and currents 2.Select date directly with calendar 3. Month table for tides and currents 4.Unlock widget 5. Map forecast for 7 days. Purchase Notes: 1. The account will be automatically renewed and deducted the corresponding fee 1 day before the expiration. 2. If you need to cancel the renewal, please cancel in your personal iTunes account at least 1 day in advance. 3. After purchase, users can manage or turn off automatic renewal in personal account settings. Terms of Services : https://www.astronomyobserver.net/h5/tidesandcurrents/user Privacy policy: https://www.astronomyobserver.net/h5/tidesandcurrents/privacy