Hello,
This is a complete off-topic to boat building, no doubt please excuse
me, slap me or just feed me with the correct group

I'm an
Argentinean/Croatian citizen living in Europe (Slovakia). Yes, quite a
mess.
Problem: My Argentinean license is expired and i cant use it any more,
i need a new one that will allow me to sail in the Mediterranean and
maybe in the UK coasts.
Analysis: I can get a Croatian license (Class C) that will allow me to
do that in theory , I could also try to apply for a RYA (UK)
certificate i could also apply for a Slovak certification (inland?). I
have no clue, what are the equivalents between them and I simply cant
get an answer on internet. If i call a French bare-boat renting
company, they take my Croatian and RYA, but not Slovak.
Is there any "International" license? something like a driving license
for a car?
Does anyone knows how this works?
Cheers
Esteban