The present document describes the expert user requirements for the Maritime Situational Awareness (MSA) use case of the INFORE project. To achieve MSA, which is defined as the capability of understanding events, circumstances and activities within and impacting the maritime environment [2], the user has to combine different data sources and perform data analysis tasks in order to derive new information, e.g., activities and events at sea. Using large-scale data fusion techniques and real-time

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... nalytics, we can also predict such events, as well as possible risks and threats and enable stakeholders to take actions to prevent them. Given these, this use case relies on the continuous/real-time fusion of heterogeneous data sources for specific areas of interest, combining global and local data, as shown in Figure 1. The term "global data" refers to Copernicus (Sentinel-1 and Sentinel-2 imagery) and Automatic Identification System (AIS) data, while the term "local data" refers to in-situ data sensed by autonomous maritime vessels (mobile platforms) equipped with appropriate sensor devices. Exploiting the continuous/real-time fusion of input data for predicting/forecasting critical events of interest, facilitates proactive decision making, and ultimately improves Maritime Intelligence, Surveillance and Reconnaissance. On the basis of the produced situational awareness, the mobile platforms will be able to autonomously adapt their navigation and sensor configurations to find a trade-off between area surveillance and the investigation of suspect targets. Sensor data fusion can support autonomous, real-time navigation decision making at the mobile platforms' level, while an effective coordination of a network of mobile platforms has the potential to highly increase the prediction and interesting event classification accuracy. The use case will assess the robustness, performance, accuracy and usability of INFORE in real-world conditions. The aim of this document is to identify the kinds of conclusions that a user working i [...]