In a fuel injection spray pattern for an opposed piston engine, the individual spray plumes have both radial and tangential components with respect to an injection axis, which adds a swirl component to a spray pattern of fuel directly injected into the combustion chamber of the opposed piston engine. An initial data setting section reads out the circuit data and the analysis condition data from the storage section and sets an initial data and a convergence condition for a solution calculating process based on the circuit data and the analysis condition data. The lower portion includes a user interface configured to provide controllable steering for said personal watercraft. The queuing functionality is made possible by a queue means which is provided within an application means, i. Further, a field plate is provided, which is disposed across the junction between the first drain portion and the second drain portion to reduce the gradient of the electrical field at the junction.