Existing ground-based data collection systems for marine litter are limited in their capabilities to address fundamental research questions that are related to marine litter concentrations, spatial and temporal dynamics, vastness of the problem, diversity of the types of marine litter and its general sparseness. The majority of the data gathered so far comes from collecting marine litter items along coastal monitoring sites and from some expeditions with boats, mainly in the subtropical gyres of the northern hemisphere. A remote sensing system could provide these data on a large scale, possibly at global level, and it would have a drastic impact not only from a scientific viewpoint, but also as an essential support tool for environmental monitoring and for assessing the efficacy of the efforts done by policymakers as well as stakeholders in addressing the marine litter issue. This session includes presentations on state-of-the-art scientific evidence based research conducted to assess our capability to detect marine litter, mainly plastic, using remote sensing technologies of different nature, from ground experiments to satellite monitoring. The invited speakers will finally address their lessons learnt and present their recommendations as the community advances toward the standardization of practices and methodologies for obtaining consistent high quality data sets that have traceable uncertainties, easy to find in open-access and comparable among the scientific community.