On Monday 25h January we started with a new research technique – the GPS tracking. Cooperating informants will be mobile with the GPS tracker always for the duration of one week, the GPS tracker will map their so called spatial mobillity. The goal is to collect data about the daily number of walked kilometres, where and how they move within the city... The data will be collected from 30 cooperating informants ( 15 from Prague, 15 from Pilsen).