NAUSICAA is a new interactive browser available on CERSAT web site allowing the visualization of satellite and in situ data over predefined regional areas, currently the Bay of Biscay, the Channel and North Sea, as well as the Gulf of Lion in the mediterrenean sea. This browser can be used with any recent navigator, users just need to register to get full access to all available features. The displayed data consist of images or vector data (mark-ups, arrows, contour lines) associated with advanced interactive functions(zoom, data extraction, color palette adjustement, layers,...). NAUSICAA is mostly intended for monitoring and understanding the bio-geophysical processes occuring in regional areas (algae bloom, etc...). It is supported by MarCoast ESA/European project.