Is it really free?#
Yes. FairlySoon is free to use, including passage planning. It is open to everyone, with no invitation or account needed.
Do you require sign-in?#
No. We may introduce sign-in in the future for features such as synchronizing your plans between devices or sharing them with other people.
Which browsers and devices work with FairlySoon?#
See Browser and device support for the Windows, Mac, iPhone, iPad, Android, Chromebook and Linux combinations we expect to support WebGPU, the technology behind our weather maps and passage calculations. Use the latest browser version available for your device.
Why doesn’t it work on my device?#
FairlySoon uses relatively modern browser technologies, including WebGPU, to render the weather and calculate routes on your device. Older devices or browsers may not support everything it needs. If you can, update your browser and operating system, and check that hardware acceleration is enabled. The compatibility guide has platform-specific requirements and steps to try.
Still stuck? Select Feedback in the planning map’s three-line menu to report the problem. If FairlySoon will not open, email us instead. Include your device, browser and any error message so we can investigate.
How does this compare to other forecasting tools?#
FairlySoon runs its routing calculations on your own device. That helps you explore weather windows quickly, without signing in or sending a calculation off to a remote routing service. You still need to download the forecast data, and calculation speed depends on your device.
Every forecasting tool has different strengths, and we cannot match every feature. If something you care about is missing, select Feedback in the planning map’s three-line menu and choose Idea. See how to send feedback.
Why do I only see five departure times?#
Each departure needs its own route calculations, so FairlySoon starts with five samples to give you a useful comparison quickly. It does not check every possible time between them.
If a particular window looks promising, choose a narrower Between range and calculate again to explore it more closely. Exactly checks a single departure. The passage guide explains how the other presets choose their five times.
What do “Fast” and “Comfort” mean? Why are they sometimes the same?#
These are two ways of looking for a route. Fast prioritises a shorter passage time. Comfort balances time at sea against the discomfort of the forecast conditions, using your comfort settings. It may choose a longer route to avoid a more unpleasant stretch.
Sometimes the quickest route is also the best fit for your comfort preferences, or a detour offers too little benefit. Both calculations can then find the same or a very similar route. Neither label is a guarantee of safety; the results guide explains how to interpret the comparison.
How is comfort calculated? Can I adjust it?#
FairlySoon combines the wind, gusts, seas, rain and storm indicators forecast along your passage, accounting for how long you encounter them. The score summarises average discomfort under your preferences, not the probability of a safe passage.
In Settings → Planning, choose Gentler, Balanced or Tolerant. They use the same inputs with different parameters; individual parameters are not currently editable. How comfort is calculated explains what contributes and how the three settings differ.
Does it work offline?#
Not as a complete offline planning tool yet. Your saved routes and settings stay on your device, and some previously loaded forecasts may be cached, but that does not guarantee FairlySoon or all the data needed for a passage will be available without a connection.
See Saved data and offline use for the current limits. Do not rely on the cache as your only source of weather or navigation information at sea.