Pay extra attention if you want to map regions in which terrain is changing substantially. For example, in the case of active mines. For such situations please increase your flight margins, i.e. get a feeling for how much your terrain differs from the SRTM database and adjust the "minimum ground clearance" accordingly. In case you are unsure about the reliability of the elevation data, consider disabling the terrain following and using the "ground elevation offset" feature (see below) for your flight. Always account for some additional space at the change of sweeps.