FTL inertia free travel, relative velocity questions

IIRC some theoretical faster then light travel methods seem to have no inertia, as the ‘space ship’ is not moving, the space around it is, the ship is still in that space, and the occupants experience no inertial effect of their travels.

My question, if i get this right, is what happens when they get to their destination and turn off the ‘FTL drive’ and reenter normal space, would they not be at velocity they left at? For instance the ship is orbiting earth when it engages the FTL drive, when it gets to Neptune or Alpha Centauri and turns the drive off, will they be at their earth orbital velocity?

The second question is would that be a problem in getting to other planets and stars? Or could the gravity and even aerobraking be reasonably used to correct for this?