'As "idealized physical time" itself does not have consistent ordering' - No. A consistent "causality" ordering exists relative to the big bang. A simultaneous "now" does not exist, but that does not prevent relative orderings from being discerned. An enforced max [absolute] time resolution is not necessary, but a consistent universal ordering requires relative speeds, which require a reference frame or gauge, and a sequencing clock for each observer. With regards to satellites, the frame is motion relative to the [center of the] Earth.