Unlike passport books, a passport card is wallet-sized, similar to the size of a driver's license. Passport cards can be used for land and sea entry to the U.S. from Canada, Mexico, Bermuda and the Caribbean.
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There are no limitations for destinations where you can use your passport book. Passport cards, however, can only be used going through a land border or seaport in Canada, Mexico, the Caribbean and Bermuda. For example, if you're planning a Mediterranean cruise, you'll need to use a passport book.
Either type of passport can be used on closed-loop sailings that call at foreign ports but depart and return to the U.S. Without either document, you'd need to provide proof of citizenship (such as a birth certificate) and proof of identification (such as a driver's license).
Do I need a passport? We recommend that everyone taking a cruise from the United States have a passport book. Though some “closed-loop” cruises may not require a U.S. passport, we recommend bringing yours in case of an emergency, such as an unexpected medical air evacuation or the ship docking at an alternate port.
Birth Certificate InformationThe following are acceptable: An original or copy of a birth certificate issued by a government agency (state/county/city) or the Department of Health and Vital Statistics.
If you are traveling when you run out of passport pages, you will still likely be able to return to the U.S., but you won't be able to continue on to other countries. If you need to travel on to other countries and are running out of pages while abroad, you should visit the local U.S. embassy or consulate.
United States and Canadian Citizens must have either a valid passport or valid documents as defined by the Western Hemisphere Travel Initiative (WHTI). Visit U.S. Customers and Border Protecion (CBP) website for additional information on WHTI compliant documents.
If you have been asked to provide a birth certificate and you were born in the UK. You should arrange to obtain an official copy from the relevant registrar's department in the area you were born. If you do not have a birth certificate and you were adopted you can provide your adoption certificate.