Fig. 8
![Fig. 8](http://media.springernature.com/full/springer-static/image/art%3A10.1186%2Fs40317-017-0134-y/MediaObjects/40317_2017_134_Fig8_HTML.gif)
Path taken by the PTT as it drifted across the North Atlantic Ocean with the geomagnetic-irradiance-SST-derived positions indicated by solid green diamonds and the Doppler-derived positions by solid white triangles. Note that the track based on the use of three inputs and processed through a state-space model is closer to the ARGOS-determined track than the two tracks shown in Fig. 2