As National Intelligence Manager (NIM) for Maritime, NMIO serves as the principal advisor to the Director of National Intelligence (DNI) on maritime issues and is the unified maritime voice of the United States Intelligence Community. In December 2016, NMIO was formally designated the NIM for Maritime by the DNI. NMIO collaborates with the Global Maritime Community of Interest (GMCOI) consisting of federal, state, territorial, tribal, industry, and academia to provide whole of government solutions to maritime information sharing challenges.

NMIO is not an intelligence production center. NMIO works at the national and international level to facilitate the integration of maritime information and intelligence collection and analysis in support of national policy and decision makers, Maritime Domain Awareness objectives, and interagency operations, at all levels of the U.S. Government. It breaks down barriers to information sharing and creates the framework for the GMCOI to share data.  NMIO enables maritime stakeholders to proactively identify, locate, track, and defeat threats to the United States and its global partners.