In the early 1960s there still remained in service a few of the A/N radio ranges that in the 1930s first brought electronic navigation to the aviation community, rudimentary devices that gave precise guidance on just four courses to and from the station. But in 1964 the transition was nearly complete to a new system of navigation based mostly on VOR (VHF Omni Range) and DME (Distance Measuring Equipment) stations for overland en route navigation and ILS (Instrument Landing System) for precision approaches.
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机译：在1960年代初期，仍保留了一些A / N无线电范围，这些范围在1930年代首次将电子导航带到了航空界，而基本的设备仅给出了往返于该站的四个路线的精确指导。但是在1964年，过渡几乎完成了向新导航系统的过渡，该系统主要基于VOR（VHF Omni Range）和DME（距离测量设备）站进行陆上导航，而ILS（仪表着陆系统）则用于精确进场。
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