1. For the purposes of this act, "personal watercraft" shall mean a power vessel defined as a Class "A" vessel by the United States Coast Guard, and which:
a. Is designed to be operated from a sitting, standing or kneeling position;
b. Is equipped with an internal combustion engine which powers a water jet pump; and
c. Cannot be operated in a manner so as to disengage the pump so as to prevent the vessel from making headway.