 Usually of a mid-range caliber, the gun is heavy enough to prove useful against surface targets including ships, surfaced submarines, and land targets.However, it is compact enough to fit into a mounting capable of good traverse and high elevation, as well as being capable of a high rate of fire, allowing it to successfully engage air targets at all angles.For example, a Royal Navy battleship of the "King George V" class had sixteen QF Mark I guns that could engage either enemy ships or high level aircraft, as necessary.