An apparatus for the preparation of a femoral condyle for the insertion of monocondylar knee implants. The raster image processor is configured for use with a complex data stream corresponding to at least one complex page description language. and a mean powder particle diameter of 10 m or less. The stabilizer enhances post-launch directional stability of the projectile by longitudinally translating rearward along the extender to shift center of pressure of the projectile aft of center of gravity of the projectile. The apparatus includes a zone evaluator configured to primarily recognize a location of the portable terminal by using first and second components of an Earth’s magnetic field and to finally recognize the location of the portable terminal by using first and second images. A four-wheel drive control method is also provided.