A plot hole in One Piece?(not a big one)?

how did montblanc norland know about the waver and the skyfish in his diary, when he was never on sky island. he thought the island sank to the bottom of the sea when he revisited with the king.|||He wrote that on his travels, he came across a bazaar (IE, flea market-type-thing) or merchant (not checking) selling these artifacts that later turned out to be from Skypeia. He never knew where they came from.





EDIT: I checked so I could get the exact quote. From episode 148 (of the original series, not the dub) using Kaizoku fansubs... starting around 18 minutes in:





"We got a very curious artifact from a passing merchant this afternoon. It's called a 'Waver,' a small, one-seated ship that looks like a ski. It is powered by its own wind, even if there is none upon the sea. I could not control it well, as it requires a remarkable amount of skill. It's become the crew's favorite recreational activity." then there's an aside about Nami wanting one, then she continues: "I was told the only place that has this kind of engine is Sky Island. Apparently there are many strange things like this up there. Speaking of Sky Island, one of my fellow explorers once showed me a living Skyfish. I can't tell you how surprised I was to see such a fish. It's a place our ship has never explored, but as a sailor, I would like to someday visit this sea in the sky. -Montblanc Norland"





So he DID know about Sky Island, but he (much like Cricket) had no reason to assume that a piece of land, like Shandia, could get there.|||the guy below got it all right....








arigato....