The Copernicus Sentinel missions support marine monitoring by providing provide timely, continuous and independent data on the behaviour, use, and health of the oceans and the associated coastal zones.

The Sentinel missions provide data support to federal, national and local studies and activities, and are pivotal in helping address a variety of policy areas.

• Sentinel-1 provides an all-weather, day-and-night radar imaging capability for Copernicus ocean services involved in the management and monitoring of the European marine environment, the Arctic environment and associated sea-ice measurement, and the surveillance of the open ocean to establish directional observations of surface wave and wind observations, and for threats such as oil spills. More on Sentinel-1's maritime monitoring applications can be found in the User Guide.
• Sentinel-3's main mission is to provide a multi-instrument capability to support the accurate parameterisation of such topics as Ocean Colour (OC), Sea Surface Height (SSH) and Sea Surface Temperature (SST). Along with SST, OC can be used to support the accurate estimation of oceanic carbon fluxes. The Altimetry Instrument onboard Sentinel-3 supports Marine applications such as Oceanography. More on Sentinel-3's maritime monitoring applications can be found in the User Guide.