Below is a postcard of the island of Juan Fernandez, where the real life Crusoe, Alexander Selkirk, spent four years and four months. The bronze plaque honouring Selkirk shown at the foot of this post, was placed on the island in 1868 (exactly a century before the students visited Largo) by the crew of HMS Topaze. It is sited at a spot called Selkirk's Lookout on a mountain of Más a Tierra.
It was not far from this site that an archaeological expedition in February 2005 found part of a nautical instrument that likely belonged to Selkirk. It was "a fragment of copper alloy identified as being from a pair of navigational dividers" dating from the early 18th (or late 17th) century. Selkirk is the only person known to have been on the island at that time who is likely to have had dividers.