Wind speed from Sentinel-1 images

Hi,

I am just wondering if the wind speed over ocean can be inferred from S1 Level-1 GRD data? There currently isn’t any OCN products available for where I am looking. I have followed instructions to use the wind field estimation, but it seems to only give wind direction? Maybe I am doing it wrong.

If anyone could give any guidance it’d be much appreciated.

Thank you!