Tide Graph Pro universal app provides over 9000 up to date and historical US tide and water current predictions without the need for an internet connection. The scrolling design and the optimized prediction engine was developed from the ground up based on formulas and data provided by the National Oceanic and Atmospheric Administration (NOAA). Additional Features of Pro version - Daily/Weekly/Monthly/Yearly tides graphs - Multiple Stations - High/Low tide Alert Notifications - Apple Watch Integration - Designed for iPad/iPhone and iPhoneX - Moon Chart - GPS/Map/Search Tides - Barometric Pressure calibration - Time offset calibration