A system that controls the speed of a marine vessel includes first and second propulsion devices that produce first and second thrusts to propel the marine vessel. The stitched shield allows the main write pole to produce a vertical write field with sharp vertical gradients that is reduced on both sides of the write pole so that adjacent track erasures are eliminated. The storage well is configured to accommodate a spare wheel and tire substantially equal in width and diameter to at least one of the plurality of wheels and tires supporting the vehicle. The second program is encrypted with a program key held in the secure device. The container includes a potable water tank and compartments for the storage of food andor medicine.