||Trails are an important resource for recreation and tourism in protected areas. They enable visitors access to the main points of interest within a protected site and help preserve the protected ecosystems by restricting the visitors dispersion. However, the increase in the use of trails can lead to negative impacts on natural resources. For example, soil erosion and vegetation loss are amongst the typical impacts of intensive use of trails.Thus it becomes necessary to identify and measure visitors behaviour on trails. The conventional way of measuring use intensity is through surveys and counters. The dissemination of GPS devices has open opportunities to collect precise and complete data on how visitors move and their itineraries. More recently, the rise of smartphones together with web 3.0 has allowed the abundant production of GPS tracks that users from all over the world regularly share on specialized social networks such as those dedicated to outdoor activities.Among these networks, the Spanish platform Wikiloc stands out, bringing together about 20 million routes in 2020.These new data sources have advantages for studying visitor movement within trails because of their granularity in terms of spatial and temporal scale. In addition, the large amount of data that users upload provides opportunities to analyze visitor behaviour in places where data is scarce or non-existent.