Do you have any idea as to the origin of the map (English, Dutch, Spanish, etc.)?
I take it you’re referring to the map referenced by Josephine Fredea (the story of a map found in an old chest, the possession of a former mariner / privateer etc.)
If so, it's probably worthwhile quoting the paragraphs most relevant to your question:
“He [the person finding the map] was immediately struck by its remarkably similarity to a certain island clearly indicated on the chart in his possession. Between this island, ‘past Sesambre’, as it is written on the chart, and a certain islet in the West Indies, there is marked a clearly defined track; and although most of the writing thereon is in Spanish and Dutch, yet it is apparent at a glance that there was a well-travelled path between them.
Other papers show that a removal and subsequent deposit of seven separate packages took place on certain dates, each package bearing separate symbols and initials.
There is also a diagram of the Cove on Oak Island, in the form of a Dutch tobacco pipe, and to this diagram is attached a paper which has not been easy to decipher.”
As noted in a previous post, Sesambre is now Sambro Island at the entrance to Mahone Bay.
I discuss the implications in my book, but it should be noted that a number of observations are ahead of their time: the suggestion that there’s more than one treasure and that there were originally two islands.
I find it strange that there was a track between an islet in the West Indies and one in Nova Scotia! My suggestion is that one of the islands was named, and this is also the name of an islet in the West Indies. It may even be that the name actually applied to both islands.
You may appreciate that the island of Tortuga was named for its resemblance to a turtle swimming (from afar, a small head and a larger body separated by water). Close up, the two islands are not actually separated. Could it be that Oak Island was once named 'Tortuga' for the same reason? There being a track between the two islands suggests that in reality it's one island with a bar connecting two prominent parcels of land.
Note that on the Skeleton Map there's a strange observation ‘20 Turtles'. What if the ‘20' has nothing to do with the turtles (I suggest it’s actually a point - an open dot - marked by the Greek letter gamma) and that ‘Turtles’ is a translation of ‘Tortuga(s)’, the name of the island, or islands?
Maybe we now call it Oak Island!