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It depends where you are. In most places you don not need any.
You must be 18 if the boat is over 13ft long you must bee 18 or supervised by an adult :)
14
a person must be at least 16 to operate a motorboat unsupervised
Most contracting companies do require certification as part of the job requirement. You may not need certification to operate all of the heavy machinery but you need the certification to get the job.
a sailboat
There are many vehicles in which the driver needs a certification or a license to operate. A Scissor lift is a vehicle in which the driver needs a certification in order to use it.
It is dependant on the legislation of the country in question
Please specify in which country or countries you intend to operate your boat.
Please specify in which country or countries you intend to operate your boat.
The restirctions under which you must operate should be printed right on the permit. Please read it.
By training, demonstration and certification