In principle yachts under 24 meters do not need to have crew on board .
However if the yacht owners employ crew voluntarily then see below :
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-If you hire an EU Citizen who is already insured in any EU State he must have with him the A1 Form and by presenting this you are exempt from any contribution .
-If you hire a NonEU Citizen he needs private health insurance
-If you hire a Greek Citizen then the contributions are set up to 40% of the salary as this is agreed with the National Seafarers Basic Salary Agreement .