Seeing as how I can't see them, perhaps this is the answer. "Invisible Island (54°1′S 37°19′WCoordinates: 54°1′S 37°19′W) is a small, tussock-covered island lying close southeast of Crescent Island and Mollyhawk Island in the Bay of Isles, South Georgia. It was charted in 1912–13 by Robert Cushman Murphy, an American naturalist aboard the brig Daisy, and was probably named by Discovery Investigations personnel who surveyed the Bay of Isles in 1929–30.[1]":)