Navigation, orientation, location tracking, target tracking and mapping equipment; data loggers and data recorders; flight data recorders; electronic data recorder for accidents; displays and data terminals for land, air and water vehicles and for industrial use; navigation, operating and display equipment for land, air and water vehicles for operational guidance, communication and reconnaissance; navigation systems, namely, inertial navigation instruments, compass instruments, gyro horizons, nautical instruments, data recording instruments including associated calculating and display equipment; radio navigation equipment; GPS receivers; GPS navigation equipment; computing, measuring, control and monitoring devices for attitude and heading reference systems; computing, measuring, control and monitoring devices for vehicle attitude and heading reference systems; computing, measuring, control and monitoring software for vehicle attitude and heading reference.;