Hi. Thank you very much for your interest. The chart is the C-MAP 4D /EW-Y311 of the Canary Islands/Azores and Madeira. It is the blue cover, the other is of Gibraltar and is the one that Furuno brings and works perfectly without problems. But the EW-Y 311 is received by Furuno without problems, the chart zone lines appear, it gives very good detail of the coastal bottoms, but I turn it off and on and it does not memorize it. Let's see what you think, Thanks.