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It turns the marine forecast into one score for the boat you own, hour by hour, eleven days out. It also measures how your boat actually rides when you record, and your rides refine your boat's numbers.

Everything in RideScore: the forecast — the map and any spot, every hour for eleven days, every Helm page and the Ride Rose, best days and alerts for your saved spots — plus BoatScore for all your boats, recording rides with the live gauge, and a report for every trip. If your subscription ends, your trips stay in the Trips tab, where you can still see and share them.

$12.99 a month or $99.99 a year. New subscribers get the first month free on either plan. Apple charges at the end of the free month unless you cancel at least 24 hours before it ends, and the subscription then renews automatically until you cancel.

• Cancel or change plans in your iPhone's Settings › your name › Subscriptions, or from Manage subscription in the app.
• Deleting the app, or your RideScore account, does not cancel a subscription. Apple keeps billing until you cancel.
• Refunds are handled by Apple, at reportaproblem.apple.com. Apple handles every purchase; your card is never seen by Solitary Labs.

Tap Restore purchases on the subscription screen while signed in to the Apple Account you subscribed with. If it still shows, write to support with the time you subscribed.

Your BoatScore is one number for how your boat handles rough water. Before you have ridden it, it is estimated from your boat's specs. As you record rides, it moves toward what your boat actually did, and the line under it says so. Only you see your boat's BoatScore.

It lists the water your boat has been measured in: Calm, Moderate or Rough. Your boat's numbers change only for water you have actually run in. RideScore never asks you to go out in rough water. Only run in conditions you're comfortable in.

Use a mount that holds the phone firmly to the boat, so it moves with the hull, and tell the app how and where it is mounted. A phone in a pocket or loose on a seat measures the phone, not the boat.

A recorded ride is how RideScore measures your boat and improves the forecast, so every ride you record is uploaded. If you do not want a ride shared, do not record it. Don't record anywhere you don't want uploaded, like your dock or your fishing spots.

Every GPS point is deleted within 90 days. Everything else about the ride is kept, with no location in it, to rate boats and improve forecasts. The privacy policy has the whole picture.

Grey water is outside coverage. RideScore covers coastal and offshore salt water along the US East, Gulf and West Coasts, Hawaii, Puerto Rico and the US Virgin Islands, the Bahamas and Bermuda. Not yet Alaska, the Great Lakes or other fresh water.

Yes, for what is already on the phone. With a subscription, the app keeps the next 48 hours of forecast for the water around you, so the map and the Helm keep working when you lose signal. Recording works without signal too; the ride uploads when you are back in range.

Recording runs GPS and the motion sensors the whole time, even with the screen off, like any app that tracks a trip. On a long day, keep the phone on power.

Your rides, boats and saved spots are kept in your own iCloud. Sign in to the same Apple Account and iCloud on the new phone, install RideScore, and they come back. If you added Sign in with Apple, sign in with it to bring back the same RideScore account.

• Delete your account from Settings › Delete account › Delete my account and data. It cannot be undone.

No. RideScore is about ride comfort. It is not navigation, it does not give routes, and it never tells you whether to go out. Conditions change, forecasts are wrong, and the operator is responsible for the vessel. For warnings and safety information, use the National Weather Service and the US Coast Guard.