C. Manual annotation vs. automatic segmentation EasyTracker allows the user to annotate parts of the track with labels in order to describe her current activity (e.g. “stopped at Acropolis museum”, “walking towards Parthenon”) [9]. This way we allow the automatic annotation of user’s activities, including her stops and movements. In detail, the user has the option to select an annotation tag/label which is attached to a specific part of the track, or to type a smart text of her choice (Fig 8).