Results: users of sea ice charts require as much information on different parameters as possible with the best detail available, … made available to them as often as possible Users: now- and forecast, e.g. once a day sea ice with 0,1-1km resolution Forecasters: sat image for validation & verification; missing e.g. high-res long-term observations in key regions Data products as outcome of whole SIDARUS, hosted by individual organisations Challenge mentioned: ‘hard to get in touch’ with users for dissemination and cooperation, due to limited time/resources to travel to a workshop Idea of uncertainty not always clear or based on intuition (Error Characterisation) SIC daily; ‘must have’ 10-20 km, ideal <10 km SIT similar Ice drift, ice volume, snow cover, melt pond fraction, albedo, surface temperature, sea ice salinity (<20 km) “Demand for sea ice data is much larger than the basic ECV parameters defined by GCOS (ice concentration, ice thickness). There is therefore a significant user potential for new satellite derived products for sea ice.”*