Harbour
For weekend sailors with one home port.
Free
- One harbour
- 7-day tide tables
- Community buoy data
Know the water before you leave the dock.
Fathom turns tide gauges, buoy readings and local forecasts into one calm timeline for skippers, pilots and harbour masters. Try it below: pick a harbour, set your draught, drag the day.
- At 09:30
- 1.2 m
- Next high water
- in 6h 06m
- Your keel
- Wait
- Clear for 10h 00m today
Built for the hour before you cast off.
- Tide windows
- Enter your draught and see the hours your keel clears the bar, for every harbour you sail to.
- Buoy overlay
- Live wave height and wind from the nearest buoys sit on the same timeline as the tide.
- Offline passage packs
- Download a route's forecasts before you lose signal. They sync when you reconnect.
- Harbour handover
- Share a read-only link with your crew or the pilot station. It updates as the forecast does.
Pay for the water you actually sail.
Coastal
For skippers who cruise and need windows, not just tables.
€10a month
- Unlimited harbours
- Draught-based tide windows
- Live buoy overlay
- Offline passage packs
Fleet
For charter operators, pilots and harbour offices.
€31a month
- Everything in Coastal
- Harbour handover links
- Up to 25 seats
- Priority support
Questions from the dock
How accurate are the tide windows?
Fathom blends official harmonic predictions with live gauge readings and corrects for surge. Windows are guidance, so always cross-check with your pilot book.
Does it work without a signal?
Yes. Passage packs store tides, wind and buoy history for your route and refresh the moment you are back online.
Which harbours are covered?
More than 4,200 ports across the Atlantic coast and the Channel, with the Mediterranean arriving next season.
Can I cancel any time?
You can cancel from your account in two taps. Your plan stays active until the end of the period you paid for.