I heard they would be moored at Galveston and Mobile. Not sure of the distance, but I believe that is pretty far away for anyone working in New Orleans. I'll have to check and see if I can find that.
Here is some from CNN on them;
Three Carnival cruise ships to aid Katrina relief
Saturday, September 3, 2005; Posted: 10:55 p.m. EDT (02:55 GMT)
WASHINGTON (Reuters) -- The U.S. government has chartered three luxury cruise liners -- Ecstasy, Sensation and Holiday -- for the next six months to provide temporary housing for victims of Hurricane Katrina, Carnival Cruise Lines said Saturday.
Two of the ships, the Ecstasy and Sensation, have a maximum capacity of 2,606 each and will be based in Galveston, Texas, while the third boat, the Holiday, has a maximum capacity of 1,800 and will likely be docked in Mobile, Alabama, the Miami-based company said.
http://www.cnn.com/2005/US/09/03/katrina.cruise.reut/