The advent of jet aircraft with higher approach speeds spawned the invention of optical landing systems to provide aid to carrier pilots. The first of these was the Mirror Landing System, adopted from the British Royal Navy during the 1950s. Pilots focused on a light shined into a concave mirror, its movements in relation to rows of lights on either side providing a reference to maintain the proper glide path. Though the system led to the elimination of landing signal officers waving paddles to signal approaching pilots, the LSO remained an integral part of the process, maintaining communication with approaching planes and triggering emergency procedures.