You can obtain RAP from the immigration counter at airport as well as at embarkation of ships at the sea port. As per the Foreigners (Restricted) Areas Order of 1963, every international tourist, except a citizen of Bhutan, needs to obtain an RAP to visit protected areas in Andaman and Nicobar. RAP is a 30 day permit issued free of cost on arrival at Port Blair. It can be extended up to 15 days more.