It’s the MAY12 revision time. Navigraph announce they can expand their airports coverage again.
In this case, it’s also the total number of charts that increase so you can find more Departure or Arrival charts, RNAV or ILS cards etc.. Use simMarket to purchase credits.
“Another 57 airports have been added to a total of 1,619 airports, with 32,171 charts in total. The new and revised airport charts are distributed over 318 airports worldwide.
Including this expansion of the coverage there are 56 updated enroute charts in total. The majority of enroute charts covering Europe, Asia and North America have been updated.”