Cruise lines are finding it increasingly difficult to predict when their ships will be in the water.

This is making it harder for passengers to plan ahead for a disaster and for them to make smart choices about what to buy or do before the cruise.

As of now, the U.S. Navy has only one Cruise Line Operators Association (COA) advisory that is issued every six months.

It has been the COA’s policy for more than a decade, but a new report from the COAS indicates the U