The Global Manual on Ocean Statistics provides guidance for national governments and national institutions to support the country-level implementation of SDG Indicators 14.1.1a, 14.1.1b, 14.2.1 and 14.5.1 in their national waters. Note that there are a number of challenges and limitations facing monitoring in the high seas. Particularly problematic are transboundary marine issues such as ocean acidification or marine plastics. For such issues, the monitoring of national waters, which is the primary focus of the SDG indicators, only shows part of the picture. This manual focuses on national monitoring, but there is a need for additional research and support to measure the areas beyond national jurisdiction for analytical use, including for analysis of the SDGs