This project will take a campaign of field measurements to characterise the signatures of both fresh and decaying sargassum in the sea and on the beach. We intend to do this on the part of the coast of Mexico known as the Riviera Maya, the core of Mexico’s tourist industry. We shall work on both tourist beaches and in protected areas which offer habitats for endangered species such as sea turtles. The study builds on SASAMS project currently funded by the UK Space Agency. Combining the two projects will help to develop a monitoring system that will enable government agencies and hotels to allocate resources efficiently, thereby minimising economic, social, and environmental impacts and enhancing the resilience of local communities.