The OSCAR source data is provided in a 20NM grid and typically has gaps at coastlines and in shallow bank areas. @meteo-GR, I think you are right - that the interpolation in windy.com visualization is creating artifacts that are not supported by the source data. See the comparison below:
Raw data:
[image: SjbMr7H.jpg]
Windy.com:
[image: hjHAIIZ.png]
The raw OSCAR data can be visualized here:
https://podaac-tools.jpl.nasa.gov/soto/#b=BlueMarble_ShadedRelief_Bathymetry&l=oscar_l4_oc_third_deg___oceancurrent_speed___1088_x_544___daynight(la=true,lo=0.55),oscar_l4_oc_third_deg___oceancurrent_dir_color(la=true)&ve=115.71814649149786,-1.8398349416397783,123.10095899149786,1.6977627146102217&pl=false&pb=false&d=2018-04-17&ao=false&as=2018-04-11&ae=2018-04-18&ass=1/day&afr=500&tlr=days
