Academy is treated like a holiday trip, not employment. This means you do not need a work visa to attend.
Technically, your Academy instructor is the designated skipper and carries responsibility for the yacht. You are attending as a student/trainee, not as a worker.
That said:
You may still need a tourist visa depending on your nationality and the Academy location.
Quarterdeck cannot arrange visas for you, but once your place is secured and first payment made, we can issue a confirmation of participation letter to support your visa application if required.
Always check with the relevant embassy or government travel site well in advance to confirm entry requirements.