Lee. I recommend navionics. Used it on my iPhone in the Ionian and French Riviera. Would be the same for iPad. Google navionics Europe. I just did and saw the app costs about $50. The charts cover the Aegean and the Black Sea. Fantastic easy zooming with great detail. I will send you grabs separately. Also great detail of the harbors. You will be amazed how easy it is to use. I get hungry and envious when I think of the Turkish food and the great cruising you are getting. All the best Irving. Sent from my iPhone