Just another note of explanation: the reason for no position update is that (in trying to do it recently), everyone's movement now depends on everyone else's location being correct. In other words, whenever there's an uncertainty (like ais523's position), that uncertainty can make EVERYONE's position uncertain after gravity is applied.
This is same problem that plagued the first game of cards (every card would be pretty much uncertain for week+ at a time so a CFJ would halt everything). That time around we fixed it gradually with increasing levels of pragmatism. In this case, I think I'd call Gravity a failed experiment all round... -though the G. stands for it.
