Only certain players can move into uncharted areas of map

[DRY411S]

I have this concept for a scenario where only certain players can move into uncharted areas of the map and reveal it.

I have no idea how to do that. Can anybody give me any clues?

I've read all the api documentation about charting and chunk generation, but I'm a bit lost on where to start.

It seems that when players get within a certain distance of the edge of the map, then new chunks are generated and charted, so I'm thinking that I need to stop some players from being able to move close enough to the edge to cause the chunk generation and charting.