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Uneven use of the landscape by grazing herbivores leads to some areas being over utilised whilst others are under utilised (Andrew 1988). Understanding the scale and impact of preferential selection provides the basis for developing sustainable land management practices. Resource selection functions correlate animal location data with landscape features. Robust resource selection functions require accurate animal location data (Hulbert and French 2001). Recent studies have used satellite based global positioning systems (GPS) to provide data on animal locations (Swain et al. 2008). Whilst detailed research has been completed to explore the spatial accuracy of GPS data, it is only recently that the problem of temporal accuracy and its impact on the predictive ability of GPS data has been investigated. ...