Based on section 102 and 103 of the Act that amends the Code of the Federated States of Micronesia, it describes the territorial sea as being established by twelve nautical miles' breadth. The inner boundary of the Territorial Sea of each island or atoll is the baseline. The outer boundary is a line, every point of which is twelve nautical miles seaward of the nearest point of the baseline.
Vanuatu reef mapping shapefile.
Data obtained from the Millennium Coral Reef Mapping Project, Institute for Marine Remote Sensing, University of South Florida (IMaRS/USF) and Institut de Recherche pour le Développement (IRD/UR 128, Centre de Nouméa).
This layer shows the 12M maritime zone for the Republic of Marshall Islands which is highlighted in the Marshall Islands Maritime Zone Act 2016.
Link to download a zip file containing OSM spatial files, a QGIS project, styles, license file and documentation on how to get started.