A system which operates a digitally controlled model railroad transmitting a first command from a first client program to a resident external controlling interface through a first communications transport. The tensioning device can be brought into a pretensioned mounting state in an advantageous way. The system also including a plurality of elements reflecting sound waves firmly fixed to the seafloor so as to outline a reference path for the passage of the autonomous submarine vehicle. An integrated circuit capable of precisely detecting the orientation of magnetic fields senses the angular position of an existing magnet and outputs an angular field reading to an interfaced microcontroller which then translates angular reading to fluid level. Besides, while tracing a current path of a node of the circuit connection net-list, the generated integrated circuit test model can be more precise if certain limitations are added.