It depends where you are. In most places you don not need any.
To operate a personal watercraft (PWC) unsupervised, you typically need to be at least 16 years old and possess a valid boater education certification. However, age requirements can vary by state or country, so it's important to check local regulations. Some places may allow younger operators to ride under certain conditions or with adult supervision. Always verify specific laws in your area before operating a PWC.
You must be 18 if the boat is over 13ft long you must bee 18 or supervised by an adult :)
In Alabama, a person must be at least 14 years old and possess a valid boater safety certification to operate a personal watercraft unsupervised. Those under 14 may operate a personal watercraft only when accompanied by an adult or a person at least 21 years old. It's important for operators to be aware of and adhere to all local boating regulations for safety.
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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.
The minimum age to operate a boat unsupervised varies by state or country, but in the United States, many states require operators to be at least 16 years old. Some states allow younger individuals to operate a boat if they have completed a boating safety course. It's essential to check the specific regulations in your area to ensure compliance.
It is dependant on the legislation of the country in question
Please specify in which country or countries you intend to operate your boat.