I'm planning to go to Andros in May, and I was looking for a ferry from Rafina to Andros on May 19 (a Friday). On the GTP site and the OpenSeas site, it shows a ferry leaving Rafina at 5:30 PM- though a few other sites don't show any ferry.
I'd like to be sure I can depend on the 5:30 ferry, is it wise to do that?
Also, assuming the ferry is ok, should I buy tickets now? and if so what is the best way to do that?