The mobile data collection has received much attention from researchers all over the world during the past 15 – 20 years. The result of this extensive work is a number of commercially available products, usually called mobile mapping systems (MMS), which are used for collection of geospatial data from cars or aircrafts. The heart of each MMS is a positioning module based on combination of GNSS receiver and inertial navigation system (INS). The module determines the position and orientation of the platform. The platform is equipped with a mapping sensor, usually a laser scanner and/or one or more digital cameras. The accuracy of collected data greatly depends on the accuracy of the positioning module. One of the main goals of this report is to assess the quality of the positioning module.