An intake module includes a surge tank, inflow ports formed from resin integrally with the tank and aligned in one direction of the tank, an intake air leading portion formed at one end portion of the tank in a certain direction and leading intake air into the tank, and a return pipe portion. The invention also relates to a method of assisting navigation for a seismic survey ship, and to a method of predicting coverage fraction by implementing such a simulation method. The mask may alternatively depict images other than facial anthropomorphic features, or simply monochrome or patterned abstract designs. A flexible lock arm-holding portion is formed on an upper portion of one inner side surface of a detection member body, and projects horizontally therefrom. QoS parameters may be determined for the service based on the policy. In order to recognize an error condition in the electronic control device and the electric motor, adequate mechanisms are provided in the circuit arrangement, the electric motor being cut from the power source by means of a relay or by short-circuiting the power source downstream of a safety device with the aid of a thyristor.