If we can imagine that during the large drought which created the first diaspora out of Africa, the sea level was almost 400’ lower than it is now.
Here is a very informative animated chart of wind and tide directions which were probably in play during archaic times. The oceans were down 400 feet making mountain islands more visible and directional sailing more possible.
St. Helena island, 16.31 degrees south, 5.67 degrees west, has a current elevation of 1,051 feet. When the water level was lower by 400’ that would have been a 1,500’ beacon island for sailors. The currents run from the South West coast of Africa directly to St. Helena Island and from St. Helena Island directly to the eastern shoulder of South America.
There is a constant wind current from the bottom of South Africa straight to the Islands of St Helena another island a little farther north, Ascension Island would have been another rest haven for sea voyagers heading for the Brazilian coast in the northern part of South America.
Ascension Island, 7 degrees, 57min. South, is at 1, 215 foot elevation. Adding 4oo’ of elevation (lower water level) to that gives a 1,600’ beacon Island. This Island would be a back up if you missed St. Helena’s.
If this route worked it would be easier to understand how Bushman art shows up on south American cave walls along with unsutured Nephelim skulls.