An interface is provided for data networking. This invention also includes a method for finding a configuration of tangents, arcs, and spirals that are as close as practical to a set of existing points along a section of track and that can define a desired shape for calculating instructions to a track lining machine. A second voltage generator may be utilized to generate an plate voltage. The molded trim portion is formed of a hard material with predetermined hardness and flexibility so as to have a substantially U-shape in section. The perimeter inflatable portions provide redundant buoyancy and allow loads acting upon the hull to be shifted laterally without compromising stability of the boat.