General Summary Global Fishing Watch (GFW) is an independent, international non-profit organization that advances the sustainability and stewardship of the ocean by offering, for free, data and near real-time tracking of commercial fishing activity. We also support new science and research and we engage with governments, management organizations, and NGOs to advance the global dialogue on ocean transparency. GFW processes a global database of vessel GPS positions, several terabytes in size, and applies machine learning models that infer each vessel’s type and size as well as when they are likely fishing. GFW is now developing new models, both on these GPS positions and on satellite imagery, to fully reveal activity in the world's oceans. These models include object