Dunwoody substitutes Fortune Island as Island IV, a notable improvement. If the problem list below seems longer than some other theories, that may be just because I've studied this theory in greater detail than some others. Correcting this problem would pull the end of the transatlantic track southward. Correcting this problem would again pull the end of the transatlantic track southward. Columbus saw a light on the night of October 11.
Theory has no place for such a light to be.
The map of Juan de la Cosa shows Guanahani as a group of islets, lying roughly east-west. At Watlings, boat trip goes less than half the length of the island. At Watlings, reef gap is 1400 meters wide. Unchallenged historical research indicates that the population of Guanahani as seen by Columbus was in the 500-1100 range. But archaeological and anthropological evidence suggests the likely pre-contact population of Watlings was around 2000 or more.