In this position, an experienced technician teaches operations and maintenance on the navigation, command and control systems on ships, teaching both the operators who use the system as well as the maintenance technicians who will maintain and repair it. The system taught includes a tactical display console, a global positioning system navigational unit (GPS), a computer, a gyro system, a LORAN navigation system, a radar system, a sonar, a fathometer, a degassing coil, and other devices.