The exemplary embodiment of the present invention integrates a two-way communications device into a personal floatation device. It also provides methods for using these catalysts. A merged cell netlist is generated that includes a first section of logic from the first netlist and a second section of logic from the second cell netlist. Preferably the area of the flat is less than 20% of the base cross-sectional area. A motion image is generated based on the adjusted motion of the at least one mobile portion. The light sensor assembly produces an output signal responsive to the intensity of the light received at the light sensor assembly.