Mangrove ecosystems play a critical role in harbouring biodiversity and providing a variety of ecosystem services. The need for developing better techniques for classifying and monitoring mangroves is increasing, especially with the growing demand in blue carbon markets. However, many countries are challenged by the need to improve their mangrove cover estimates to inform decision-making on coastal land use and to guide local conservation efforts including restoration planning. This manual was developed to help overcome this problem by providing guidance, specifically targeted to build capacity for mangrove resource managers on how to use and take advantage of the latest technologies in mapping and monitoring mangroves. It enables collection of data that informs conservation decision-making, guiding the planning of mangrove restoration and protection activities that will ultimately lead to enhanced management and conservation of mangroves. In addition, case studies are presented on estimating mangrove extent, structure, condition and change, using a range of remote sensing-derived sources that are focused on < 5-m spatial resolution.