French activists stand on the deck of their boat moored in Pireaus port, near Athens, Greece, Monday, (AP).
A lone French yacht was on Wednesday headed for Gaza after sneaking out of Greek waters in defiance of a ban on the departure of aid ships aiming to run Israel's blockade on the coastal strip.
The MV Dignite/Al Karama, which left Greek waters early on Tuesday, is heading slowly towards Gaza, a spokesman for the French Boat to Gaza campaign told AFP, saying they had not yet given up hope they would be joined by others from the ill-fated Freedom Flotilla which had been due to set sail last week.
Most of the 10 ships which had been due to join the naval convoy are stuck at ports in Greece after Athens imposed a blanket ban on the departure of any vessels destined for Gaza.
Another ship, the Irish-owned MV Saoirse, pulled out of the attempt last week after organisers said the boat had been sabotaged while it was docked at a port in Turkey.
So far, only the MV Dignite, which has 12 people on board, has managed to set sail, with organisers saying it was at an unspecified location in international waters.
"They're getting on very well," Thomas Sommer-Houdeville told AFP by phone from Athens, saying the vessel had begun to move slowly towards Gaza on Tuesday afternoon after waiting for several hours in international waters to see if the the Greek, Norwegian and Swedish activists on board the MV Juliano would to also manage to set sail.
"Yesterday afternoon, our Greek colleagues (on board the MV Juliano) were not able to leave, so they decided to start sailing slowly" towards Gaza, he said after speaking by phone to activists on board the Dignite.
"They are now heading for Gaza slowly so if any of the boats manage to get out, they will be able to meet up with them.
"For the time being, our desire is to go to Gaza," Sommer-Houdeville said, admitting the activists on board would later decide based on what was possible "logistically and technically."
"At the moment, we have one boat which has managed to break the Greek blockade and we are hopeful that there will be others," he said.
Shortly after the yacht set sail on Tuesday, organisers had initially said it would be "off Gaza within a day or two."
Both the US Audacity of Hope and the Canadian vessel, the MV Tahrir, each of which have some 50 passengers and crew aboard, have tried to set sail since Athens imposed the ban on Friday, but were turned back.
And two of the vessels have also sustained damage, in what organisers claim was sabotage by Israeli agents.
Officials in Athens say they imposed the ban for the "safety" of the activists on board in the wake of last year's bloody showdown, when Israeli commandos raided a six-ship flotilla heading for Gaza, in a confrontation which left nine Turkish activists dead and dozens of people injured.
More than 300 activists from 22 countries had signed up to participate in this year's flotilla, among them dozens of middle-aged and elderly Americans and Europeans.
Israel has made no secret of its determination to prevent the Freedom Flotilla II from reaching Gaza, which has been under a blockade since 2006 after militants there snatched an Israeli soldier who is still being held at a secret location.