The present invention is a method for forming sheet material into contoured parts. The flow channel is provided with at least one inverter device for inverting a radial temperature profile in the flow of the fluid material, between upstream and downstream ends of the at least one inverter device. The method relates to the dropping of, directing of, and absorbing of kinetic energy from an item among the plurality of items as the item contacts portions of the apparatus. A first part of the training sequence includes at least one pulse of energy that is greater than the energy of a pulse carrying payload information. The submersible craft is thus always in optical communication with one or more beacons when in the communications zone, regardless of the orientation of the craft and regardless of the position of the craft within the communications zone. A video image from broadcast data is displayed in a same window with the HTML document.