Jet skis, airboats, and other motorized personal watercraft are prohibited. There have been boats and oars recovered which indicate proficiency with boats and watercraft. A maritime flag is a flag designated for use on ships, boats, and other watercraft. Vehicles using nozzles include jet aircraft, rockets and personal watercraft. The production featured different types of personal watercraft (PWC), especially Kawasaki jet skis. They are the most common motorized method of propelling small watercraft. A folding rear ramp give access for motorcycles, all-terrain vehicles, personal watercraft or racecars. The first watercraft were canoes cut out from tree trunks. It includes small arms, combat vehicles, aircraft, watercraft, artillery and transport vehicles. A submersible is a small watercraft designed to operate underwater. Three rivers navigable by small watercraft are nearby. Paddle wheels are used on some older watercraft and their reconstructions. Kawasaki's "Jet Ski" has become a genericized trademark for any type of personal watercraft. Ships and other watercraft are used for maritime transport. Quadrofoil Q2 is a two-seater, four-foiled hydrofoil electrical leisure watercraft.