Odd little display bug. I have a grav survey ship in a level 1 nebula (2500kms per level of armor), whose max class speed is 2000kms, with 4 layers of armor, that shows up as infinite time to destination, 0 speed on the system map screen, but that shows normal speed and normal time to destination on the task group screen, and which seems to be moving at normal speed every turn. I should note that this ship was refit from an earlier version of the class that had only 1 layer of armor, and when it had that one layer of armor it showed the correct speed in a level 4 and a level 5 nebula. I have not actually entered those other nebula yet to see if they now show the same error though.