Great Circle

Forecast & Marine Weather

The Great Circle, a human adventure...

Like each success stories, Great Circle has been created in 2010 by passionate people who decided that their passion could also be their job. At the beginning, we found 3 visionary people with a complementary set of skills: an experimented skipper, a famous weather marine analyst and a brilliant marine scientist.

They quickly decided to grow the team to create “Squid”, a weather software for sailing boat. Listening skipper’s needs, Great Circle continues to create new innovative services to improve boat performances.

At the present time, Great Circle collaborates with most of top ranking off-shore sailing teams and race managements through the world (Vendée Globe, Volvo Ocean Race, Route du Rhum, America’s Cup, etc ).

Contact Details

  • Great Circle
  • Place de la Gare, 3
  • 1330 Rixensart
  • +32 (0)2 633 31 00
  • squid@greatcircle.be

Our trade

Because our job is a passion, our focus is to provide you the best possible service.

1. Squid

Squid is a software to download and watch the weather grib files and make routing (with isochrone method). Squid can also display satellite images (visible, infrared, water vapor, colorful) and retrieve synoptic charts and observations (SYNOP, METAR and scatterometry).

2. Squid Mobile

The last application of Great Circle is Squid Mobile! You can download it for free of charge since the Apple store, and connect with your login to take advantage of all your features! Do not hesitate to download it!

3. Best-Start

Best Start® is a decision support tool for skipper to determine the best weather window to attempt to break a record. It can determine, for nearly three hours, the best starting point in the next ten days and evaluate the probabilities of beating the record

4. Best-Sails

Best Sails is a tool that allows for very quick statistical study of weather and conditions of state sea on a route. In addition, the analysis also Best Sails the usage of sails statistics. The tool is based on historical data with high resolution very good qualities.

5. Support Weather

Great Circle offers support weather, as well for both : skippers and racing direction. This consists of weather reports sent at regular interval, as well as decision support tools to objectify the weather risk. Great Circle can also handle weather briefings before departure for racing / records / regattas.

6. Consulting

Great-Circle carries out specific studies in meteorology, both in the marine field than on land. Our R & D team can adapt some specific tools as needed.

They work with us

Join us!

Customer development coordinator

Attracting a full user community. You have a pronounced interest about sport, and race sailing? You work directly with the direction, and you create a full communication package. Interessed? Contact us to join our team!

Front-End Developper (Internship)

Passionate with user experience, your dream is to get in a young and brilliant team. Interested about sport and race sailing, do not hesitate to contact us to integrate the development team in Great Circle.


Back-End Developper (Internship)

You have a strong analysis mind, and your passion are advanced programming language. Your talent? You are able to incoprorate a young and innovating team. Interested in this offer? have a look ans join our team!

Great Circle

squid@greatcircle.be