Jelle Hardenbol and Thijs Ligteringen of the Hydrographic Service of the Royal Dutch Navy gave a lecture about the duties of the Hydrographic Department and military hydrography. Thijs Ligteringen discussed maritime limits, boundaries and law of the sea. It was a special afternoon because off interesting lectures and after all the online lessons and start in 3 subgroups, the students were finally all together in a room.