Implementation of Direct Georeferencing (DG) Technique for Medium Scale Mapping Albadi R. Alnoaimi UAE Military Survey, UAE Email: albadi@uaesurvey.ae Direct Georeferencing (DG) is the direct determination of exterior orientations parameters of image coordinates, by utilising directly measured exterior orientations and system calibration information. The exterior orientations are measured during the image flight using GPS/IMU-integration (Global Positioning System/Inertial Measurement Unit) in this case, from AEROcontrolTM (IGI, Germany). The most important factors affecting the quality of DG are the quality of the direct sensor orientation, and the quality of the system calibration. Such factors should be taken into consideration for the elimination of inaccuracies. The unknown parameters in the system calibration are the angular misalignment between the IMU and the camera axes (boresight misalignment); and the camera calibration. The DG systems must be calibrated in the airborne conditions, because the boresight misalignment can be determined only by photogrammetric techniques. The aim of this paper is the evaluation of the result by introducing DG technique throughout the use of ISAT (ImageStation Automatic Triangulation) software, by importing the exterior orientations parameters after the correction of the boresight misalignment into the software. This task requires a small calibration block, Ground Control Points (GCP) distributed throughout the block for AT measurements and Bingo software for adjustment, then taking one file called “iteration.dat” form Bingo files into AEROcontrol IGI to find the offset parameter, then to bring back the corrected parameters “corrected exterior Orientation” into ISAT software to finalize the result.