The special-purpose simulator of the main post control station is designed to practice crew skills in control and monitoring of the onboard systems of the ISS Russian Segment as well as station modes in nominal and off-nominal situations. The simulator is unique because there are no operator workstations in its configuration in contrast to the simulator facility of the ISS RS. Instead, Russian and American onboard computers and functional mock-ups of consoles of the ISS RS Main Control Station are installed in a special room. All the other consoles, modules’ controls and displays are simulated virtually and represented on video monitors. Thus, the simulator allows to conduct planned or self-training on studying and controlling onboard systems of the ISS RS without the benefit of SM mockup.