NOVELTY - The vehicle has a fin system (213) comprising a fin that rotates about an axis of rotation, where the axis of rotation has a spatial relationship to a swimmer body (211) that changes when the vehicle is in wave-bearing water. The swimmer body has a rigid fore section, a midsection that is relatively flexible in a vertical plane, and a rigid aft section. The swimmer body has a central tubular housing and wave-actuated fins that extend on either side of the housing. The swimmer body has batteries (216), a rudder servo mechanism (218), control electronics (217) and sensors e.g. hydrophone.    USE - Wave-powered water vehicle.    ADVANTAGE - The vehicle carries out tasks that are tedious, expensive or dangerous for a vehicle operated by human beings. The vehicle eliminates the need to man the vehicle, and carries communication and control equipments, thus allowing the vehicle to follow a course directed by signals sent to the vehicle.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for the following:    (1) a method of utilizing wave power, comprising placing a wave-powered water vehicle in a body of water    (2) a method of obtaining information, comprising analyzing information obtained from or recorded by a wave-powered water vehicle    (3) a method for controlling a function of a wave-powered water vehicle, comprising sending signals to the wave-powered water vehicle    (4) a float, a swimmer, a swimmer body or a fin system, of the wave-powered water vehicle.    DESCRIPTION OF DRAWING(S) - The drawing shows a wave-powered water vehicle.    Float (11)    Swimmer (21)    Tether (31)    Body (111)    Solar panels (112)    Global positioning system (GPS) receiver (113)    Antennae (114)    Electronics box (115)    Rudder (116)    Swimmer body (211)    Nose cone (212)    Fin systems (213, 214)    Electrical pass-through (215)    Batteries (216)    Control electronics (217)    Rudder servo mechanism (218)    Rudder rod pass-through (219)    Rudder actuation rod (221)    Rudder (222)    Tether legs (311, 312)