Navionics are offering all charts for Europe ( Excl. Denmark & U.K.) for little bit more than 500 SEK. Same offer for South America. I’m not suggesting that you should sail with an Ipad only. But it would work as a backup. It is also an excellent planning tool. There is a lot of information with pictures from Marinas etc.
Make sure that you have a IPad with a GPS. ( Only the 3G model has a GPS.)