In this preliminary experiment, we conducted actual route finding experiment in outdoor fields to build a set of measurements to represent map-reading ability. Besides, the reason is we want to observe the participant behavior objectively. For the outdoor experiment called Real-Navi, we prepared two routes as shown in Figure 1. The first one (Fig. 2 (a)) is toward a goal point located on the north-west side of the starting point. Its total distance was 780 meters and was expected to be reached in 9 minutes in the best scenario. It also has 15 intersections where the subject would have to choose which way to go next and 7 corners where the road bends. The region was a residential district, so very few landmarks were existent. Furthermore, at the spot indicated by the red circle in Figure 2 (a), the name of the shop was changed. The other path shown in the Figure 2 (b) was set a rather shorter length, 600 meters, and was expected to be reached in only 7 minutes in the best scenario. In this case, there were 7 intersections and 8 corners. In addition, at the spot indicated by the red circle in Figure 2 (b), there is the very small road such as a back street, and it is very difficult that pedestrians find it. The two paths were unfamiliar to all the participants and their visual figures were not given in advance. The other experimental settings are given in Table 1.