We're doing a Northern Lights trip next year on QM2 that ends in Southampton, and we are then taking the next sailing of the ship to New York, though in a different cabin.  Will we need to disembark (or debark - not sure if there's a difference) on the turnaround day, or can we hang out somewhere on the ship?  If we do need to get off, what is our position re: reboarding - do we get an embarkation time like new passengers and go through the check-in process?   If it makes a difference,