A personal watercraft is disclosed having a hull and a sub-deck disposed on the hull. An initial desired flow rate and initial operating conditions are input into a control system that is in communication with the valve, and the control system is initiated. Within an interior of the housing are positioned at least one fiber optic adapters. A variety of other arrangements by which electronic devices can interact with the physical world are also detailed, e. A background generator module determines a variation of color of the image about the perimeter of the image. The restricting member includes a restricting part that engages with the restriction accepting part to restrict relative movement of the electric power source member with respect to the tubular member in an axial direction of the tabular member.