North Sea surface drifter data from Heincke cruise HE513, Drifter 19 - Carrasco, Ruben; John, Uwe; Henkel, Rohan; Horstmann, Jochen (Helmholtz-Zentrum Geesthacht Centre for Materials and Coastal Research, Alfred Wegener Institute, Carl von Ossietzky Universität Oldenburg, 2018)