During the flight an AEROCONTROL INS system measures the coordinates and orientation parameters for each photograph.

After post-processing with GPS data from a ground based receiver an accuracy of less than 10cm can be achieved. The distance from the GPS antenna on the aircraft to the camera is compensated for to obtain the 6 parameters for the centre of the photos. These exterior orientation parameters are suitable to directly geo-reference the photographs in a digital orthophoto production.

Use of the INS system reduces the delivery times for the end product dramatically.