The aim of this test was to compare various results from Imego's IMU (Inertial Measurement Unit) with those obtained from reference sensors during a standard dummy neck calibration test. In this test, the rigid rod with neck and head attached is lifted to approximately two meters and thereafter released resulting in a pendulum movement which is stopped at a standard honey comb structure attached to a fixed steel structure.The IMU was mounted in the head of the dummy in the position where the reference sensors normally are located, while the reference accelerometer itself in this case was mounted 5.5 cm below and 2 cm behind the IMU. In addition, two potentiometers, one located in the head and the other in the rigid pendulum, were used to calculate the angle versus time during the test. There were some obvious differences between the INS signals and those from the reference sensor(s). This difference when observed first can be explained by the fact that the reference accelerometer and the IMU had slightly different locations.