>> thank you to tom foreman for that report. talking about the currents and how the piece traveled. >> the indian ocean gyre that moves counterclockwise. >> a good explanation and models to explain how this happened. >> the movement is so slow here which is why this has taken so long to wash up ashore here. good to see you. we will talk about the global circulation pattern and with the ocean currents here. focus on the search area and where they had been focusing the search and where it continues to be the focus. this is west of australia now. we are taking you, 2647 miles, generally 4,000 kilometers. the question is how did we get debris from west of australia to move essentially 4,000 kilometers all the way to reunion island. perhaps we have debris along at madagascar itself. we want to look at the global ocean currents here. that has to do with the gyres.