Oh one other thought. It&#x27;s been a while since I&#x27;ve been on a deep-dive with this material so I&#x27;m considering the possibility that perhaps the updates to the clocks that the engineer spoke of are some ground storage of corrected time.<p>Let&#x27;s presume that we&#x27;re both right but I&#x27;ve misinterpreted where the corrections are kept. Then I could totally see how the clocks could have drifted many minutes over their lifetimes but the actual &quot;time&quot; number sent is an abstraction and some central corrective facility keeps up with the correction for each clock.<p>So then the daily drift updates are on the ground and done to the central system and it&#x27;s corrective notation.<p>It&#x27;s effectively the same but technically different. I&#x27;ll have to look into this possibility. I&#x27;m not sure how individual devices would then access this central repository of corrections.