[Rupert]

My plan is to have the m-drive kill your velocity relative to any large mass 'nearby', to avoid tricks involving building up huge vectors some-place else, and then lining up the ship and turning off the m-drive (a trick you can do with 2300AD-style stutterwarps and the like, if you've the patience).

This also gets around questions about matching orbital velocities with planets and adjusting for relative stellar velocities when your main drive doesn't add real velocity.