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Stevenson's admission of the earlier stories and authors he'd plagiarised borrowed ideas from comes in My First Book - his little-known preface to Treasure Island, first published in McClure's Magazine in September 1894.
First Stevenson acknowledges very readily some minor ideas and motifs taken from other writers:
It is not to be wondered at, for stolen ...
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TL;DR: The opening chapters of Treasure Island make it clear that the "Admiral Benbow" must be within a few miles of Lynmouth in Devon.
Stevenson wrote a detailed account of the writing of Treasure Island. Although this does not mention the "Admiral Benbow" or its location, it does include the passage:
… how troublesome the moon is! I have come to grief ...
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William Ernest Henley. Per Andrzej Diniejko, in William Ernest Henley: A Biographical Sketch:
Robert Louis Stevenson modelled the most famous pirate in literature — Treasure Island's Long John Silver with his wooden leg — on his crippled friend Henley.
Doris Alexander, in Creating Literature Out of Life, devotes a chapter to Stevenson's creative process ...
answered Jun 26 '17 at 20:15
Nathaniel is protesting
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Billy Bones (first mate)
Confirmed from his own mouth:
"I was first mate, I was, old Flint's first mate, and I'm the on'y one as knows the place. He gave it me at Savannah, when he lay a-dying, like as if I was to now, you see."
-- Chapter 3, "The Black Spot"
Long John Silver (quartermaster)
Confirmed from his own mouth:
"No, not I,” said ...
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As far as I can tell, it does seem that you've uncovered an inconsistency or mis-writing on Stevenson's part. Let's analyse the whole journey carefully, using a map of Treasure Island for reference:
At the start of Chapter 24, Jim wakes up in the coracle at the southern end of the west coast of the island:
I awoke and found myself tossing at the south-west ...
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Allardyce, he was the skeletor compass. And Darby McGraw.
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