The PAAF Celestial Navigation and Bombing Trainer was housed in a concrete "grain silo" and contained a fuselage section in which trainees experienced a realistic mission simulation. Inside, the navigator took star sightings with a celestial sextant to determine the aircraft's location, while the pilot, copilot, and radio operator worked from their positions and the bombardier operated below the navigator inside the fuselage. A complex system of domed celestial maps, projected ground terrain, and a fuselage motion base created the effect of night navigation, bombing, radio communication, and aircraft movement. The trainer used lights in the dome for navigating stars, a projector and terrain plate for the land below, and mechanical systems that moved the dome and fuselage to simulate yaw, pitch, and roll, while a smoke blower added cloud effects and hits were shown for bombing practice. The celestial navigation trainer buildings stood at the north end of Pratt Army Air Field, which had four of these trainers, and the building between them was a boiler house used to provide heat in winter.