A navigation system of the present invention provides a user of a moving object with a return path on an original driving path when the moving object deviates from the original driving path. The outer layer can have surface features and has a surface area of greater than or equal to 140% of a planar, flat, non-profiled surface area for a same unit area. Various embodiments have conductive cages created by multiple through-holes extending through lamina in the PCB, thereby increasing radiation propagation. Such consideration alleviates problems that can arise if cell discard decisions are based solely on either loss priority or emission priority.