This article contains experimental results of GPS and IMU complex system research for real-time kinematics positioning. The research was made both in static and dynamic modes for a device MTi-G manufactured by Xsens Technologies. The dynamics research was made both at low (on foot) and high speed, in the last case by means of vehicle. The research shows the possibility to use complex GPS and IMU device for undersurface radar positioning applications. When the visibility of the satellites is limited or satellites are unavailable, the errors increase very rapidly over time