Talk:Winter 2015 Event/@comment-14.169.99.4-20150203084133/@comment-24978536-20150203111904

Ship lock is a mechanism what has been present in the two previous events. It works in a way that when you use a ship girl in a certain operation, her card is "tagged" and you are unable to use that ship girl in other operations of the event. Thus, she is "locked" and unable to participicate in other maps of the event. However, the lock may not apply to all maps in the event.

For example, in Fall event 2014: When ship girls were used in the E-1 or E-2 maps, they were locked and were only usable in those maps. E-3 Had to be cleared with other ship girls, who were also locked to that map only upon use. However, in the extra operation E-4, you could use even the locked ship girls you had used in previous maps, so the ship lock mechanism basically did not apply to that map.

The ship lock mechanism makes it so that you have to have a  sizeable fleet to be able to clear the events. More than 6 sortie DD may very well be a necessity, even though outside of events you'd never need more than 6, at least right now anyway.