DSK wrote
Because whitecaps usually begin forming around 8 knots and are regular
at 10.

http://www.stormfax.com/beaufort.htm
"F3 knots: 7 - 10 Gentle breeze, Large wavelets; crests begin to
break; scattered whitecaps"

http://www.r-p-r.co.uk/beaufort.htm
"F3 knots: 7 - 10"
"Gentle Breeze Large wavelets. Perhaps scattered white horses"

You might want to ask Navvie just to make sure.

DSK