Golunvolo, I live in a seaside suburb south of Athens, which is about 30 kms from the commercial part of the port of Piraeus (our biggest commercial port). Therefore, you can see these ships everyday. The day the picture was taken (with the Nikkor 300mmE)
it was cloudy and a bit foggy. I assume the ships you see are crossing the Gibraltar straight, so traffic is on the "heavy" side.