In America, the US Coast Guard issues licenses for commercial
use, ie carrying paying passengers for hire.
There is no USCG issued license
for recreational boaters. Many US states have licensing requirements for recreational boaters, but there is no universal standard.
The USCG licenses go something like this:
OUIPV (operator of uninspected passenger vessel, commonly called a 6 pack as it is limited to 6 passengers)
50 ton master with or without sailing and oceans endorsement
100 ton master .....
And so forth
I suspect the Yachtskipper certificate is a recreational license
and there is no US equivalent.