Current aerospace and rocketry literature confirms that launch vehicles and rockets rely on inertial navigation/guidance systems and onboard computers to navigate and control their flight.
The retrieved papers extensively discuss guidance, navigation, and control (G&C) systems, onboard computers, and inertial navigation systems specifically used in rockets, missiles, and launch vehicles. Papers [8], [9], and [10] directly address rocket inertial navigation, control systems, and onboard computers during launch, fully establishing the claim. Papers [0] and [1] provide broader support for aerospace vehicle guidance and onboard computation. No papers refute the claim.