WepresentasynthesisoftechniquesforrotorcraftUAVnavigationthroughunknownenvironmentswhichmaycontainobstacles.D*LiteandProbabilisticRoadmapsarecombinedforpathplanning,togetherwithstereovisionforobstacledetectionanddynamicpathupdating.A3Doccupancymapisusedtorepresenttheenvironment,andis