Drone exam · Navigation, charts, and mission data Operations Mapping Which distance is most useful for estimating mission energy? Select one answer A The actual planned flight path including diversions and return. B Only the straight line from launch to the target. C The road distance to the site. D The map scale bar length. Check answer Correct answer: A. The actual planned flight path including diversions and return. Energy depends on the path the aircraft will fly, not the shortest geometric line to the target.