While this was useful for bringing the aircraft onto the direction of the runway, it was not accurate enough to safely bring the aircraft to visual range in bad weather; an aircraft normally descends at a rate of about 3 to 5 degrees, and if they were 3 degrees below that they would crash. Beams were used only for lateral guidance, and the system was not enough on its own to perform landings in heavy rain or fog. Nevertheless, the final decision to land was made at only 300 metres (980 ft) from the airport.[1]