GNSS based Adaptive Monitoring for the Assistance of Persons with Orientation Difficulties. - Martin Litzenberger; Klaus Dittrich; Birgit Unger-Hrdlicka; Hendrik P. Buimer; Ivan Rigamonti; Wil Wintjens; Matthieu Arendse; Patrizia Murko; Matthias W. G. Zeller; Stephanie Auer (ICT4AWE, 2021)