Computer-implemented techniques are disclosed for verifying circuit designs using subgraph caching. The steerable well bore drilling tool includes an inertial measurement unit to output a measurement used to determine an azimuthal deviation and inclination of the steerable well bore drilling tool during a drilling operation. In typical embodiments, the smartphone and the charger-stand rotate together to compose a panoramic photograph, or for video-conferencing, gaming, or other uses. In some prior art latches, such an action by an \u2018impatient passenger\u2019 would prevent the drive motor on the latch from unlocking the latch, thereby necessitating the owner to press the unlock button on the key fob a second time. Computer A has an identity verification system for authenticating the identity of individuals having badges and loading the clearance information into the volatile memory after the badge is attached to the wearer.