A very useful mobile guide to use, both for planning and while sailing in Greece, is Sail-Pilot. It is a complete Greek Waters Pilot, being authorised by the Hellenic Navy Hydrographic Service. It is a mobile app available for iPhone and Android platforms, with specific layouts for smartphone and tablet devices. It includes the official Sailing Directions for the Greek Waters, which are being updated every year with the latest notices to mariners. You may find more info here:

http://sail-pilot.com

The app includes nine libraries for the Sailing Areas that you may purchase separately from the app stores through the app:

Cyclades Islands Sailing Area

Ionian Islands Sailing Area

Dodecanese Sailing Area

Saronic Islands Sailing Area

Sporades Sailing Area

Myrtoan Sea Sailing Area

North East Aegean Sailing Area

Crete Sailing Area

Corinthian Gulf Sailing Area

The price of the libraries spans from 7.99 € to 17.99 € (ex. VAT).

If you are considering sailing in more than two Sailing Areas, it is more economic to download the Sail-Pilot Plus app that includes all Sailing Areas and purchase one license for 49.99 € (inc. VAT).

The Sail-Pilot team of specialists, which I belong to, assists sailors free of charge with planning their Sailing Holiday in Greece.