BlueBert is right about the island in the BVI; it shows on my chart as "Dead Chest". And it's not too far from Norman Island, the island that supposedly is the basis for the island in Treasure Island. The Bight on Norman Island was a pirate hangout from what I've heard; due to the position of this bay in relation to the Sir Francis Drake channel it made a good place for one square rigger to wait in ambush for another coming down the channel.
Has anyone ever heard different words to the "Dead Man's Chest" tune? If so, that might be an indication of the origin and date of the song. "Maui" or "Rolling Down to Old Maui" was, for example, a French fife and drum tune before words were added to make it a song about whalers.
