In this Part:
"drive" includes impel.
"inflatable device" includes a ski tube.
"power driven vessel" means a vessel propelled by mechanical power and includes a jet ski.
"ski observer" means the person in a vessel who is 12 years of age or older and is responsible for at all times watching the water-skier or any inflatable device being towed by the vessel and relaying any signals of the water-skier to the driver.
"vessel" includes a boat, launch, yacht, canoe, raft, pontoon and anything capable of carrying persons or goods through or on water.
"water-skier" includes a person who is being towed, by any means (whether or not for sport), in a manner similar to the manner in which a person is towed while water-skiing.