Since July 1st, Greece has reopened its borders to tourists in all regions, after flying to Athens again since mid-June. For the first crews who arrived there was a bit of confusion that the Greek authorities did not communicate well that every tourist had to show a QR code when entering the country, which is either printed out or carried on the smartphone and actually 48 Hours before entry must be requested. This is regulated in a corresponding ruling by the Ministry of Foreign Affairs.
It says: "All visitors are strongly advised to install the Visit Greece app before entering the country. Travelers should, ideally before the flight, fill in the Passenger Locator Factor (PLF) with their contact details on site in Greece."
Unfortunately, this form and the corresponding app can currently not be found on the two websites of Visit Greece and the Ministry of Foreign Affairs. The easiest way to do it at the moment is via another official Greek website of the Civil Protection Office, which can be found here.
The background to the requirement is that the Greek government randomly selects travelers for Covid-19 tests directly at the airport and then carries them out on site. If the test later turns out positive, the travelers are contacted and have to be quarantined for 14 days. The Greek state bears the costs. Anyone who knows the ailing Greek health system may be skeptical about it. However, so far Greece has had very few Covid 19 cases (just under 3400) to complain about during the entire pandemic.
It is difficult for sailors that they can only give the address of the charter company in the port of departure, but this does not really help in an emergency. Whether this is a problem remains to be seen, but so far there have been no reports of crews who have been turned away at the airport.