The Symi Visitor summary ferry timetables are available again for 2015. Regular visitors will notice that there are fewer fast ferries on the Rhodes-Symi sector and fewer ferries altogether on the Symi-Kos sector. This is because for most of the week the Dodekanisos Pride will be working north of Kos. However don't assume that this is what will actually operate.I've never known a complete summer to pass without major changes to the timetable. As changes happen you can see them at:
http://symivisitor-accommodation.com/blog/