59.5 degrees south

This week I have been reading 59.5 degrees south.This is what happened... we are helping Dan an on board geologist to drop another Argo float into the sea.One more to monitor the sea.We are now on board it is very wobbly.We wait for Dan's GPS to say exactly 59.5 degrees south then we push the Argo float in the water,cardboard and all.The cardboard will come of and leave the Argo float to do its own thing.Today around 3500 Argo floats are adrift.From in the arctic ocean to the southern ocean.They get released on big and small boats.they don't just bob in the water they are designed to be like a jelly fish up down,up,down.An Argo float can last up to 5 years and they measure up to 1.2 metres high.