Back in February, I was in Bluff helping 'wake-up' and load 20 Argo Floats on board the 'Spirit of Enderby'. They were going to be deployed on Gareth Morgan's 'Our Far South' expedition.
I've been keeping an eye on where they are and what info they are telling us. Here is the trajectory of Argo Float WMO 5903880
See how it is heading off to the right (west to east). This is due to the Coriolis effect. In the Southern Hemisphere winds and ocean currents generally move in this direction and the opposite direction in the Northern Hemisphere.