No, for watercrafts like boats and jetskis, the specification of a “licence” is referring to the boating licence. There are also boats and jetskis you can navigate without any licence: For licence-free boats, the approved number of places is usually limited to maximum 4 passengers, also you have to stay close to the coastline (therefore you cannot i.e. navigate from Mallorca to Ibiza with them). Jetskis can be driven without a licence, if you’re driving them in a circumscribed area, so no other boats can cross your way, or if you’re accompanied by a professional guide, i.e. at a jetski tour. You can find the information, if a licence is necessary, directly in the particular offer. At chartering boats with licence, you usually have the opportunity to add a skipper, so you don’t need to bring neither a licence nor the deposit.