The cruise consultant onboard the Navigator told me that I had to use the open booking we made within 6 months.......to put it on a cruise any cruise in 2005. Then she said that I could keep rolling it over even into 2006 as long as I cancel the cruise before final payment and rolled it over to another cruise. She said I could keep doing this until we finally decide which cruise we want to take. I still think it is worth the extra 5% off of the cruise fare to do this. Just make sure that you note on a calendar somewhere when your 6 months is up or when you have to roll it over again.