The Defense Center for Operational Oceanography (DCOO) is part of the Danish Defence Acquisition and Logistics Organization. In Denmark, DCOO is known as FCOO, Forsvarets Center for Operativ Oceanografi. FCOO collects, validates, stores and disseminates oceanographic, meteorologic, and hydrographic data and products. We cooperate closely with several other Danish authorities like DMI, DMA and DTU as well as with a wide range of international institutions. DCOO consists of 14 employees, including engineers, oceanographers and meteorologists as well as data and IT specialists – many with a PhD. FCOO is the single point of contact in the Defence in relation to meteorological, oceanographic and hydrographic data and products and the associated work in the Defence area and NATO. FCOO develops and distributes dual-use products for operational use by the Danish Armed Forces, especially the Royal Danish Navy. We provide oceanographic, hydrographic, and meteorological support in the form of data and advice which is used in support of national and international operations and exercises. Dual use means that the military products often can be used for civilian purposes. Four times a day we produce a "weather report for the sea", which generates input to a wide range of use, especially for search and rescue operations, oil spill predictions, ice reports and forecasts for the Danish waters and support of the Vessel Trafficking Services and safety of navigation purposes. Data and products are developed not only for Danish waters but increasingly also for use and support in arctic areas – especially the waters surrounding Greenland. We use data from satellites for example for monitoring and surveillance as well as in connection with validation of DCOO products. DCOO collects and stores AIS information for a variety of uses.