This document applies to the INSITU_GLO_PHY_UV_DISCRETE_NRT_013_048 product. It consists of a total of four datasets (see Table 1), three of which are dedicated to near-surface currents  measurements and one dataset with additional sub-surface velocities:
• cmems_obs-ins_glo_phy-cur_nrt_drifter_irr, named drifter in the rest of the document: nearsurface zonal and meridional raw velocities measured by drifting buoys, wind & wind stress components, surface temperature if available (see I.2.1). These surface observations are part of the DBCP’s Global Drifter Program but contains also other data sources (OGS data on the Mediterranean Sea, see §II.1)
• cmems_obs-ins_glo_phy-cur_nrt_radar-total_irr, named radar_total in the rest of the document: near-surface zonal and meridional raw velocities measured by High Frequency radars (HF radars, as acronym HFR), standard deviation of near-surface zonal and meridional raw velocities, Geometrical Dilution of Precision (GDOP), quality flags and metadata. These surface observations are part of the European HF radar Network (see Mader et al., 2017 and Corgnati et al., 2018)
• cmems_obs-ins_glo_phy-cur_nrt_radar-radial_irr, named radar_radial in the rest of the document: near-surface zonal and meridional components of raw radial velocities measured by High Frequency radars (HF radars, as acronym HFR), magnitude and direction of near-surface zonal and meridional components of raw radial velocities, standard deviation of near-surface zonal and meridional components of raw radial velocities, quality flags and metadata. These surface observations are part of the European HF radar Network (see Mader et al., 2017 and Corgnati et al., 2018)
• cmems_obs-ins_glo_phy-cur_nrt_argo_irr, named argo in the rest of the document: ocean currents derived from the original trajectory data from Argo GDAC (Global Data Assembly Center).
Deep current is calculated from floats drift at parking depth, surface current is calculated from float surface drift.