"Maps, charts, codes and other documents and navigational equipment necessary, in addition to any other equipment required under this Order, for the intended flight of the aircraft including any diversion which may reasonably be expected."
There is an AMC (Accepted Means of Compliance) to EASA Part-NCO (Non Complex Operations - that's us) that states that electronic solutions are acceptable as long as accessibility, usability and reliability is assured. (
https://easa.europa.eu/system/files/...20Part-NCO.pdf page 23 at the bottom.)
So if you're operating under EASA Part-NCO then you can carry two iPads with up-to-date navigation software, and no paper, and be legal.
If you do choose to carry the aeronautical data on dead trees, it is reasonable to expect that you have a current map, and keep it current. Especially now, since this year and next all frequencies will change from 25 kHz to 8.33 kHz spacing. Which means that the notation of each frequency on your map will increment by 5 kHz. (E.g. EHEH TWR went from 131.000 to 131.005)
Edited: Having said all that, it is *incredibly hard* to find which country has filed specific derogations against which specific article. This page (
https://easa.europa.eu/document-libr...om-regulations) points to three spreadsheets that somehow contain what you're looking for.
In any case, until a country has implemented EASA Part-NCO, national law applies.