This is the great Coral Sea ferry that we took so often from Judy's place on HK island to Poly's mom on the mainland side. Much smaller and more fun than the star ferry on the west side of the harbor, the coral sea ferry route is for locals, not tourists. And it's cheap too -- about 60 cents US!
I saw this person in a sampan in the harbor on the east side (we always take the Coral Sea ferry route from Sai Wan Ho to Lei Yue Mun (Carp Gate). Hard to believe that this type of transport is still being used!