Abstract: Ongoing monitoring is essential to providing security and safety of maritime and air operations. This paper presents the research in the area of automatic analysis of movement of unrestricted vehicles like ships and airplanes. The analysis is aimed at extraction of trajectory information, and the results can be used to identify anomalous behavior in archived and real- time data. In this paper we focus on data acquired using the GPS by the vehicle and transmitted to a ground station using a dedicated system (AIS for ships and ADS-B for aircraft). However, the methods could be applied to positional information obtained by other means, e.g. a radar or sonar installation. We also present a low cost solution for gathering ASD-B data.