Doesn't the couple approaching the boat in the photo give you some perspective of how large the vessel is?

If I'm not mistaken, this boat is very similar to the Gubert Tide, a vessel that I was once asked to take photos of while passing by Table Bay. Perhaps it's obvious from the design of it's stern, but this type of boat is often used to carry supplies between harbours and oil rigs. I guess in some way they're the bakkies (pronounced buck-keys) of the ocean. :)