[billyruffn]

Most countries require a certificate of competence in line with the requirements of the vessel's flag state's regulations. However I've had to show my certificate in various countries, such as Germany and Croatia, even though a certificate is not required in my country.

I've been in quite a number of maritime countries and no one has yet to ask of a certificate or license. Europe seems to be the only place that's making an issue of certification. I agree w/ Omatako that if you have the opportunity to take a certification course, by all means do so. That said, my guess is that on the 'milk run' route around the world you are not likely to encounter anyone who's going to ask to see your ticket.