How Arena works

Arena combines the wind and wave forecast with each cove's shelter by direction and with the history of boats counted by satellite, to tell you where to anchor and how busy it will be.

Shelter by direction

Each cove is measured along 36 directions: in each one, the stretch of open water to the coast (the fetch, on the OpenStreetMap coastline). With the hourly forecast of wind, wind sea and swell, Arena works out a shelter score from 0 to 100 and shows it as “Well sheltered”, “Acceptable” or “Exposed”.

Expected crowding

Copernicus' Sentinel-1 (radar) and Sentinel-2 (optical) satellites pass over the Pityusic Islands several times a week. Arena has counted the boats anchored in each cove since 2017 and, with each day's weather, a model estimates how busy it will be. It is an estimate, not a live count.

Verified content

Cove summaries, places and their highlights are published only when at least two reliable sources, checked by hand, confirm them. Opening hours appear only when confirmed. Being listed is free and on merit: no place pays.

Privacy

Your GPS position never leaves your phone. This website uses no cookies or analytics and loads nothing from third parties.

Data sources

Arena gathers open data from these sources. It is downloaded on the server and served from Arena; your phone does not ask third parties for it.

Wind, wave, current and weather forecasts, including the route map's. Data from Open-Meteo.com, CC BY 4.0.
Météo-France weather and wave models (meteofrance_seamless, meteofrance_wave, meteofrance_currents), served by Open-Meteo.
Contains modified Copernicus Sentinel data 2017–2026.
Bathymetry (sea depth).
Posidonia meadows and regulated zones of the Balearic Islands.
Aerial orthophotos for the cove photos.
Boats with AIS anchored «right now», from aisstream.io; small boats rarely carry AIS.

Arena is a decision aid and does not replace official nautical information: not for coastal navigation.