This report deals with the problem of time critical precision engagement of ground targets. The Swedish forces have participated in the process of determining the research direction of this project. The studied scenarios are primarily  GPS-jamming of a GPS/INS/Laser guided bomb of the type Enhanced Paveway II (GBU-49) for the case when laser guiding is not possible.  UAV-target tracking of a moving ground target in severe urban environment where a single UAV has been compared to the case of a group of UAV:s. Simulations of the integrated navigation system of GBU-49 show the importance of having not only a sufficient high tracking threshhold (good jamming protection) but also a high navigation acuraccy before the GPS is lost. Simulation results also show that a group of three formation flying UAV:s is more than twice as effective as a single UAV that loses sight to a moving target during 37% of the flight time in an urban scenario.