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https://www.ivisa.com/grenada-travel-authorization

A Grenada Travel Authorization is a legally valid passport issued by the Grenada government. It doesn’t contain any nation information but includes an entry destination and request. Permission to travel out the territorial waters is only granted upon demonstration of a Grenada Travel Authorization. The authorization, which serves as a ticket to get the right of passage into the Grenada National Parks, can be obtained in the authorized tourist office.