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I have travelled to and stayed on around 60-70 Greek Islands over a period of around 27 years. I have done backpacking trips around all these island groups - NE Aegean, North Sporades, Dodecanese, Cyclades, Ionion, and several times around Crete.
I have a good knowledge of ferry services around the islands, though not always accurate due to the variable nature of services. In that respect, anyone who is in an island ticket agency at any given time is the real 'expert'.