A ceramic substrate has two side surfaces in a lengthwise direction and two side surfaces in a widthwise direction Y intersecting each other, and is also provided with at least one flat surface in a thicknesswise direction. The ship propulsion further contains an electric motor, the rotor of which is directly mechanically coupled to the at least one propeller via a shaft such that the at least one propeller may be brought into a respective rotating movement by a rotation of the rotor. The analysis device applies a finite element method to the analytical model to figure out the vibration of the circuit board, which is caused when the concentrated loads vibrate with a constant period. In another aspect, a central content server is able to return requested content to requestors in a format suitable for their device.