NB: This is not a duplicate of another question. Despite this question being different and clearly stating and demonstrating how it is different below, it has been marked as a duplicate. If you agree, please vote for this to be re-opened. In the other question, the OP asks how an inhabited base could be cloaked from enemy detection. The answers suggest things like living underground, using electric cars, and other things to make the technology more low-key. This island has no habitation, and no technology, so these things would be irrelevant and alter the answers given.
So, this is gonna be one of the last in the basic "overcoming impossible obstacles" phase in planning my possible book project. After that's done, you'll probably be seeing less of 'that guy with the island'.
What I want to know is how a 55,000km2 island in the Indian Ocean could be kept hidden from any country's mapping satellites (and Google Maps), until the year 2019 when it was discovered (from the surface) by local fishermen. In my last question, many people brought up the issue of the island being undiscovered for so long, and there was lots of talk about cover-ups and stuff like that. I recommend you check that out in the link above to get some inspiration if you're planning on answering. (Look in the comments section of the question block.)
So, there are a few conditions to consider that will need to be a product of the cover-up (or whatever other way you guys come up with.). First of all, if it was a cover-up, there would have to be a reason why the organization who originally found the island wasn't there when the island was "discovered" by the rest of the world.
The second condition is that the first people to set foot on the island are a team of researchers - not the US military, or any other military force. Again, on my last question, some people believed that if the government had been kept in the dark for so long, they would assume a threat and send military units to quarantine the island. I believe JBH, who took part in the discussion in the previous question, said he(?) knew how this condition would be achieved, so I'll be interested to hear from him.
I would also be interested to hear if there are any other ways the island could have remained hidden besides an illegal cover-up, are there any other phenomena, natural or synthetic, that could achieve this?
Note: This is not a duplicate of the question "What would it take to keep a large island in the East Pacific hidden?". This one has different conditions to that one, conditions which would alter the answer to the question.