The Great-Circle



Founded by pationate sailors and skippers, Great-Circle’s field of expertize is marine weather and the production of high resolution meteorological data. These data along with an isochronous routing module are available with Squid. Developped by Great-Circle, Squid is a weather marine software.

This website is about Squid. Here, you can purchase a subscription according to your needs.

However, Great-Circle does more than that. We also provide consulting and assistance services during races.


Our strengths

Data accuracy: GCWF ultra (1km) and GCWF + (3km)

Compare as much Grib files as you want

Consider as the most realistic model, the European model  (IFS/CEP) is at your disposal.

Use the meteorological data from the global American model : GFS

Use high resolution data such as : Hirlam, GCWF, NAM …

Change the display settings of the meteorological data.

Display as much models as you want on the same meteogram


Contact us

Place de la gare,3

1330 Rixensart (Belgium)

VAT : BE 0830.642.276

Contact :

Phone : +32 (0)2 633 31 00

Contact form



References : Route du Rhum, Volvo Ocean Race, Vandée Globe, Transat Jacqes Vabre, Circuit Figaro, Circuit Mini...



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