A method of socket design and fabrication for Below-the-Knee amputees that utilizes manual measurements. Portions of the radar signal that are reflected by entities located beyond the second side of the wall are detected. The engine has an output shaft arranged to drive a water propulsion device of the watercraft The upper wall has a top surface and a bottom surface. Similarly, results obtained from executing the query can be converted back to a form understandable by the application. A monitoring device is cooperatively used to allow setting of the quantity of package units to be monitored and the instantaneous quantity of package units based on the conducting state of the leads.