The Aeroscout team made use of some warm days in spring to go for a synthetic aperture radar (SAR) mission with the B-330 UAV and together with Gamma Remote Sensing AG. The SAR needs very accurate position and attitude information which was provided by a Honeywell HGuide n580. A specific 80m long flight line had to be exactly repeated several times by the UAV, which is challenging for the navigation algorithm as well as for the flight controller. The final result will be a high resolution map of the scanned slope which allows to compare it to future scan flights.