Marine weather app for iPhone

The weather app, but for boating.

A marine weather app for the check before the dock. Wind, waves, tides, weather, observations, and official advisories in one place, with a Boat, Caution, or Nope call for your boat and the hours you want to be out.

Plymouth Harbor in the Boat or Nope iPhone app: a Boat call, a best window from 9:00 AM to 1:00 PM, and wind, waves, and tide through the afternoon.
A Boat call at Plymouth Harbor, with the best window from 9:00 AM to 1:00 PM, 10 knots of wind, 1 foot waves, and a 9.2 foot tide.
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One clear call

Boat, Caution, or Nope for the harbor you are checking, with the best window for the hours you plan to be out. Wind, waves, and tide sit next to the flag. If the forecast is still loading, the app says it is checking the water. If a piece the call needs is missing, it says Incomplete instead of inventing a flag.

Wind, waves, and tide on one timeline in the Boat or Nope app, with the best window marked from 9:00 AM to 1:00 PM.
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One shared timeline

Wind, waves, and tide share the same hours, so you can see the afternoon without lining up three apps. The week ahead marks each day’s best outing window inside the limits you set.

Boat limits in the Boat or Nope app: a 15 knot wind limit, a 2 foot wave limit, and 4 hours on the water.
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Your boat in the math

Set a wind limit and a wave limit for each boat, and how many hours you want to be out. The app looks for a continuous stretch that fits those limits. The limits organize the forecast. They are not a promise the water will stay inside them.

All the usual checks

Marine weather, without the tab scavenger hunt.

Marine forecasts, buoy observations, tides, weather, and advisories are all useful. They are just not especially fun to assemble across a pile of tabs while everyone else is asking when the boat leaves.

Boat or Nope puts the useful pieces on one shared timeline and shows a daily call along with the reason behind it. Save the waters you check most, then move between today and the seven-day outlook without rebuilding the picture every time.

Tuned to the outing

Your boat. Your comfort limits.

A calm day for one boat or crew may not feel the same for another. Add more than one boat, set wind and wave limits for each one, and choose the active boat for the outing you are planning.

Boat or Nope looks for a continuous forecast window that fits those limits and the time you expect to spend on the water. The limits help organize the decision; they do not turn a forecast into a safety guarantee.

No mystery green button

One honest call, with the evidence left in.

Open the wind, seas, tide, weather, observation, and advisory details; see when the forecast was generated; and check which NOAA and National Weather Service sources were used.

If decision-critical data is missing, Boat or Nope says Incomplete instead of quietly filling the gap with a reassuring guess. That is less magical, and much more useful.

Made for the dock, not the helm

A planning aid, with room left for seamanship.

Boat or Nope is for pre-departure planning. It is not navigation, emergency guidance, or a substitute for official forecasts, current observations, local knowledge, proper safety equipment, and your own judgment before and during an outing.

Know the water before you go.

Save your waters, tune the forecast to your boat, and keep one clear view of the day close at hand.