Personal watercraft
Personal watercraft means a vessel which uses an inboard motor powering a water jet pump as its primary source of motive power and which is designed to be operated by a person or persons sitting, standing, or kneeling on the vessel, rather than in the conventional manner of sitting or standing inside the vessel.
Source
40 CFR § 63.3981
Scoping language
Terms used in this subpart are defined in the CAA, in 40 CFR 63.2, and in this section as follows: