Topic summary
Arc of fire

Extracted from the Wikipedia article Field of fire.
Arc of fire
The arc of fire of a mounted gun is a horizontal ("traverse") angle range within which the gun (or guns) can be fired. It can be limited by the construction of the gun mount or obstacles (for example, superstructure of a ship). If there are no restrictions, the term all-round arc of fire is sometimes used. Overlapping arcs of fire create a crossfire.