Our a/c was ramp checked at Texel last year and the Dutch Feds were most insistent to see a current chart (which was present in the a/c).
The Accepted Means of Compliance (AMCs) to EASA-NCO (or something like that) specifically states that electronic solutions (for charts, maps, approach plates and whatnot) are acceptable, as long as availability is assured. In other words: You have to have a backup if your primary device packs up.
As an aside: If you have the 2015 Dutch ICAO paper map, now is a good time to annotate it. Late last June, all Military CTRs changed to 8.33 channel spacing and as a consequence, their frequencies changed. This means the 2015 paper map is now technically outdated already, unless it's annotated with the new frequencies. So in this particular case, a paper map that's only updated once a year is a worse solution than electronic maps.