An apparatus is provided for predicting the future behavior of an object such as a vehicle. A location and time determining system, such as a GPS receiver (6), determines the geographical location of the vehicle and the current time and supplies this to a processor, such as a computer (1) with a program memory (2). The processor periodically records the location and time to form a record of sightings of the vehicle. The processor (1, 2) compares a sequence of recent sightings with earlier recorded sightings from the record to find matching sequences which represent journey segments which match over a predetermined minimum distance. The processor (1, 2) retrieves some of the sightings which follow the matching sequences and derives from these a prediction of the future behavior, for example possible future routes and destinations of the vehicle.