Thanks for the replies. My husband has a passport already. DS and I do not. For such a short cruise, I think we'll take our chances and use birth certificates.
No, a passport card is essentially worthless on a cruise. Yes, it will get you on and off the ship, but so will a certified birth certificate. It won't allow you to travel by air in an emergency.
My suggestion--either go "all the way" spending the bigger bucks and get the passport OR spend nothing and use the certified birth certificates. Spending "less" on something that will do no good in an emergency makes no sense to me.
The only thing having a passport card will do is make it a little easier to get the emergency passport because the State Department has already verified your info to get the card.
"Closed Loop" Cruises: U.S. citizens who board a cruise ship at a port within the United States, travel only within the Western Hemisphere, and return to the same U.S. port on the same ship may present a government issued photo identification, along with proof of citizenship (an original or copy of his or her birth certificate, a Consular report of Birth Abroad, or a Certificate of Naturalization). Please be aware that you may still be required to present a passport to enter the foreign countries your cruise ship is visiting. Check with your cruise line to ensure you have the appropriate documents.
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