By far the best person to ask in a member
named Yeloya who owns a charter company in Marmaris. He has a lot of connections in Rhodes and sails
the area constantly. As an FYI, you might check with him about chartering out of Marmaris. They do one ways and also can easily arrange for agents to clear you in/out of Greece
. I used the Rhodes agent two years ago and it was worth double the 80 euro I paid to do all the paper work. I had a premium spot right in Mandraki harbor. Very cool spot and I'll be back in May for at least 4 days.
If you do charter from Rhodes, how long will you be sailing. The meltemi doesn't really blow strongly in that area. I'd suggest going up to Symi, over to Nisyros, then a long sail to Astypalya, then up to Amorgos, then Levitha, then a sled ride down to Tilos, and back to Rhodes. That's probably more than a week sailing but a good time. You want to try to make general east/west as it's a PITA to head
NW to NE due to the Meltemi.
There's also a good chance I'll be passing by that area in September so keep a look out or send me a PM.