This study investigates the capacity of children to develop map-based skills in spatial orientation in an urban environment unknown to them. In this quantitative study, a total of 328 pupils of grades 3-5 had to achieve specific skills with regard to map-based skills in spatial orientation (such as turning-off skills, transformation from map to place, finding one's direction, navigation). These skills were tested by means of a map of Münster (Westphalia, Germany). This paper focuses on factors of potential influence, such as prior knowledge in the field of map reading as well as family- and school-related previous experience.