No permission, visa or passport is required for Indians. But it is vital to carry ID proofs and RAP (Restricted Area Permit). But foreign nations should have Indian visas. It is also applied to foreigners who are coming from a private yacht or charter to Andaman. In addition, they also have to carry RAP (Restricted Area Permit), which is available on arrival from immigration counter at Port Blair airport or at seaport. You can get RAP for 30 days, which you can extend to 15 days max.