The track was built up by poles having numbers and arrows attached on the top part indicating the order and direction the participants had to walk around the track (see Figure 5). This setup was designed to simulate the navigation of mobile phone users in an urban environment in order to produce controlled yet realistic results to best effect. Users had to orientate themselves within the track in order to not walk into the wrong direction. Participants were asked to perform the reading and target selection tasks while walking on one of the two tracks and were motivated to walk with their normal walking speed. The participants performed a test walk though the course before participating in the study in order to learn how to navigate using the numbers and arrows on the poles.