To confirm what the Manual says about Covered Arcs and Spotting... there is a bonus for spotting things within an Arc. The size of the Arc matters, however, as a HUGE Arc is effectively no different than saying "pay attention everywhere!". And the bonus isn't enormous to begin with, but enough to give an edge sometimes. Edges are always a good thing even if the ultimate result isn't what you want to see. Nothing in war is guaranteed! The speed of engaging, however, isn't differen