PredictWind vs Slackwater

Official weather supplier to the 37th America's Cup and The Ocean Race. Founded by Olympian and two-time America's Cup winner Jon Bilger, and used by over 2 million sailors, cruisers, fishers, boaters, paddlers, wingfoilers and kiters. Free wind, wave, tide, current and rain forecasts for anywhere on the water, from your home harbour to the middle of an ocean. FORECASTS YOU CAN CROSS-CHECK Compare the world's top-ranking models side by side: ECMWF, AIFS, ICON, UKMO and GFS, plus our own PWAi, PWG and PWE models. Add high-resolution regional models including HRRR, RRFS, AROME, ICON D2, UKMO 2K and our exclusive 1 km PWG & PWE, where available. When the models agree, go. When they don't, you know to wait. MAPS BUILT FOR THE WATER High-resolution forecast maps down to 1 km in selected areas for wind, gust, wave, rain, cloud, pressure, CAPE, air and sea temperature, ocean data and solunar, with animated streamlines, wind barbs or arrows and synoptic displays. Split-screen maps compare models or conditions, such as wind alongside currents. DASHBOARD TO SEE EVERYTHING Our new Dashboard brings together your Daily Briefing, wind, wave and tidal current maps, forecast graphs and a 10-day forecast, all in one view. WEATHER ROUTING PredictWind calculates the optimal route for comfort or speed, factoring in wind, wave, tide, ocean current, depth and your sailing yacht's or powerboat's dimensions and performance. Power Routing finds fuel-efficient routes tailored to your powerboat. Plan longer passages with ECMWF ensemble forecasts out to 30 days. DEPARTURE PLANNING See the conditions you'd meet across four departure times, then choose the departure window that suits your boat and your crew. TIDAL AND OCEAN CURRENT MAPS Tidal current maps at 100 m resolution in high-current areas, a 400 m model within 90 km of the coast and 4 km out to 600 km offshore, coupled with global ocean currents for the complete picture. AI ROUTING AND DEPARTURE SUMMARIES Trained for what matters to boaters, our AI summaries give you expert insight to help you make the right call and keep your family, friends and crew safe. PLAN AHEAD WITH CLIMATE DATA Explore 10 years of wind, wave and weather data, with monthly averages and wind and wave roses. Compare typical morning, afternoon and night conditions to choose when and where to sail, race or explore. PASSAGE GUIDE Find the best time of year for passages worldwide, with months rated Good, Marginal or Avoid, plus written summaries of historical conditions and seasonal planning advice. SEE WHAT'S HAPPENING RIGHT NOW Live wind observations, webcams and AIS coverage of more than 280,000 vessels, so you know the real conditions before you leave the dock. Hybrid satellite imagery, global rain radar and lightning overlays help you track approaching weather, rain and thunderstorms. ALSO INCLUDED • Daily Briefing: the forecast as a plain-text summary. • Tables: detailed wind, wave and rain analysis side by side. • Graphs: compare multiple forecasts at once. • Forecast Validation: see which model has been most accurate near you, checked against actual wind observations. • Weather Alerts: get told when your conditions arrive, including GMDSS extreme weather warnings. • Local Knowledge: the best spots, amenities and activities at your destination. • GPS Tracking: a free tracking page for your blog or website with wind data overlaid. • AI Polars: learn your boat's performance for more accurate routing. Requires a DataHub and Professional subscription. • Forecast Replay, Sail Crossover charts and comfort routing modes for maximum roll, vertical acceleration and slamming. Free to download, with forecasts for any location. Basic, Standard and Professional subscriptions add higher-resolution models, longer-range data and expert tools. Terms and conditions: https://www.predictwind.com/about-us/terms-and-conditions Privacy policy: https://www.predictwind.com/about-us/privacy-policy

The tide and currents app that works without signal. Tides for more than 5,000 stations worldwide and currents across the US and Canada, already on your phone — on the water, on the beach, in the anchorage, with no bars and nothing to load. No spinner. No "no internet connection". You open it, and the answer is there: rising or falling, flooding or ebbing, and how long until the next high, low or slack. And it does the part most tide apps skip. Heights are the easy half. The harder question is the current: when does the pass go slack? How hard is it running at max? Can you get through before it turns? WORKS WHERE THERE IS NO SIGNAL Predictions are made on your phone, not fetched. Down a dead-end road, out at the point, in an anchorage, or with the boat's electronics down — you get the same answer you would have got at the dock. The map for your area and your favourite stations stays on your phone too. CURRENTS, NOT JUST TIDES Slack, max flood and max ebb on one curve, with speed and direction. Drag your thumb across the week to read any moment. Paired current stations link to the tide at their reference port. SUN, MOON AND THE TIDES THEY DRIVE Sunrise, sunset and twilight, the moon's phase, spring and neap tides explained, and solar and lunar eclipses, for every station. ON YOUR WRIST, HOME SCREEN AND SIRI An Apple Watch app that works without your phone: turn the Digital Crown to move through the day. Home screen widgets for the next event and today's curve. Ask Siri for the next low tide, high tide or slack window. On iPhone and iPad, in 16 languages. FREE, NO ACCOUNT, NO ADS Every station and every date is free and stays free. No account, no ads, no tracking, and the app is open source. Slackwater Premium is optional and funds development: lock screen widgets, Apple Watch complications, alerts before the tides and currents you care about, and station calendars. Choose a yearly subscription or a one-time lifetime purchase. WHERE THE NUMBERS COME FROM Tides for more than 5,000 stations across a hundred countries are built in, from NOAA, the Canadian Hydrographic Service, Norway's Kartverket, Toitū Te Whenua Land Information New Zealand (LINZ), Denmark's DMI, the Japan Coast Guard and the TICON-4 global tide-gauge catalogue, and checked against each station's published tidal datums wherever it has them. Currents cover the United States and Canada: more than 2,500 NOAA current stations, plus 23 Canadian passes from the Salish Sea to Haida Gwaii and Cape Breton. Canadian tide stations download their data from the Canadian Hydrographic Service once, then work offline. Seven Canadian current passes use downloaded harmonic models; the other sixteen fetch CHS predictions when you are online and keep the downloaded window for offline use. Where we cannot publish numbers we trust, the station is listed but blank instead of guessed. Predictions are not observations — conditions vary with weather and river flow. Not for navigation. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://slackwater.xyz/privacy/