We’ve selected these apps based on their quality, user reviews, and overall reliability. If you want to nominate an app for this list, email us at nominations@healthline.com.

“The cure for anything is salt water: sweat, tears or the sea,” author Isak Dinesen once wrote. And scientific evidence now seems to back up Dinesen’s words.

A study supported by the Sardinian Regional Authority found that sailing can actually improve quality of life for people with severe mental disorders. And other research from the University of Edinburgh and Sail Training International link sailing to increased self-confidence and capacity for teamwork, as well as the ability to conquer fears.

Of course, sailing has some great physical perks, too. Constantly moving to maneuver the boat and maintain your balance can work your core strength as well as boost your agility. Hoisting and trimming sails tones your arms and back. Being out in the sun gives your body stockpiles of much-needed vitamin D.

Importantly, sailing can also be dangerous if you’re not appropriately prepared. Having the right training, tools, and safety equipment when you’re out on the open water is a must. We’ve selected these apps to help you find the resources you need to have a safe, healthy sail. Check them out before you grab your favorite topsiders and hit the docks.

Knots 3D

iPhone rating: ★★★★★

Android rating: ★★★★★

Price: $1.99

The granny knot may be fine for your shoelaces, but it has no place on a boat. Do you know your bowline from your half hitch? How about a sheet bend? Knots are extremely important for all kinds of purposes aboard ship. This app will help you master 121 knots. Animated tying and untying how-tos demonstrate from different perspectives. This app is a must. After all, the last thing you want is to head for a shore excursion and return to the dock to find your boat has floated away!

United States Coast Guard

iPhone rating: ★★★★★

Android rating: ★★★★★

Price: Free

The Coast Guard is the definitive authority when it comes to boating safety. Their app is a no-brainer for anyone heading out on the waterways. The app helps you learn safety laws and requirements, recommends the right safety equipment, and points you to local resources in your area. It also lets you request a safety check, file a float plan, and get weather info from the nearest National Oceanic and Atmospheric Administration (NOAA) buoy. You can also help keep the entire nautical community safe by reporting pollution, navigational hazards, or any other suspicious activity.

iPhone rating: ★★★★★

Android rating: ★★★★✩

Price: Free

There’s no getting around it: Sailing is expensive. The costs of boat ownership, insurance, gear, and mooring fees have undoubtedly taken the wind out of many enthusiasts’ sails. But there’s an app that may solve your problem. Go Sailing is a social network that connects you to other sailors. Why not tag along as crew for a fellow sailor’s outing, or invite someone to come aboard your ship? It’s safer to sail with a buddy, and sharing the expenses of your trip will lighten the load on both of your wallets. Who knows, you may just make a lifelong friend!

iPhone rating: ★★★★★

Android rating: ★★★★★

Price: $4.99 (iPhone), $5.99 (Android)

Not every port is tranquil. Many marinas and waterways can be very congested, and unfortunately, boating collisions happen all too often. Enter MarineTraffic. This app tells you the real-time positions of other boats. The app connects to automatic identification system (AIS) receivers in major ports around the world. You can use it to gauge your proximity to other boats, as well as their course and speed. It also lets you track your own course.

iPhone rating: ★★★★★

Android rating: ★★★★✩

Price: $3.99

It’s not always possible to get out on the open water. Weather, crew, and other personal commitments can put a damper on the best-laid plans. But that doesn’t have to stop you from learning to sail. The American Sailing Association’s Sailing Challenge app puts the experience at your fingertips, wherever you are. The modules cover important areas, like trimming the sail and tacking. Next time you’re stuck commuting home, why not escape to the waters of the British Virgin Islands with their virtual trainer?

iPhone rating: ★★★★✩

Price: $14.99

iNavX is designed with an advanced chart plotter and navigation tools to help you find the best conditions and routes. The app pulls together charts from multiple trusted sources. It also integrates with external GPS, AIS equipment, and nautical instruments. Use the app to mark good fishing spots, geotag photos, monitor tides and weather, and share your route.

iPhone rating: ★★★★★

Price: $7.99

If you’re sailing close to shore, understanding the tide is critical. AyeTides gives you data on tides and currents for more than 12,500 spots around the world. And the app works offline, too. This means you don’t have to worry about finding a network connection when you’re away from cell towers. To use the app on your iPad, try AyeTidesXL instead.

iPhone rating: ★★★★★

Price: $2.99

Imagine you’re cruising. You cast your anchor for the evening and head below deck for some shut-eye. What if you wake up to a giant bang as your boat crashes into a rock ledge or coral reef? Anchor! tells you when your anchor drags, so you can make sure that never happens. Simply mark your anchor and set a perimeter, then choose an alarm. If you drift out of that circle, the app will alert you. One user commented, “This saved my stern!”

iPhone rating: ★★★★★

Android rating: ★★★★✩

Price: Free

It goes without saying that you need wind to sail. It’s better if you know whether it’ll be gusty or dead calm on the water before you drive 45 minutes to your mooring. SailFlow uses more than 50,000 weather stations to report and forecast the wind and weather around the world. The app will even alert you to good wind conditions, so you don’t miss a perfect day on the water. Check out the precipitation map, forecast, and tidal report to make sure conditions are safe before you leave the harbor. Upgrade to PRO to get proprietary forecasts and exclusive reporting from their weather stations.

iPhone rating: ★★★★✩

Android rating: ★★★★★

Price: Free

Lucky sailors spend a lot of time out on the water, enjoying the breeze and the golden rays of the sun. But all that UV time can also add up to some serious skin damage. UVLens helps you make smart decisions about your sun exposure. Check out their new UV forecast, assess your personal burn risk based on your skin type, and set reminders to apply or reapply sunscreen.

Android rating: ★★★★★

Price: Free

If you want to get where you’re trying to go, a reliable compass is crucial for navigating in open water. Digital Compass promises to be high precision, offering a true heading and a magnetic heading. And its simple interface makes it easy to read. It also includes a map view with latitude, longitude, and address.

iPhone rating: ★★★★✩

Android rating: ★★★★★

Price: Free

Cruising into new waters is exciting, but it doesn’t mean you have to go in blind. With Cruisers Sailing Forum, you can ask or search for all kinds of advice, from technical expertise to boating innovations. There’s also a classifieds section where users can find community-relevant posts, like boating jobs or items for sale.

Android rating: ★★★★★

Price: Free

The Fast Track GPS Tool will help you navigate like a pro. The app provides waypoints and routes in GPX, maps, weather forecasts, and proximity alerts. It’ll help you choose a leg of your route based on wind direction and let you see your bearing and deviance. Racers should check out their tool to time to line, which helps you cross the starting line right at the gun.