What it does When the ship is in vacuum and on a collision course with the ground, it will automatically show time-to-impact, and the estimated burn time to kill your velocity at ground level. When the ship is in orbit and has an upcoming rendezvous with a target ship, it will automatically show time-to-closest-approach, and the estimated burn time to match velocity to the target. When the ship is on a course to enter or exit atmosphere in the next few minutes, shows time unt