1.Radar apparatus, radio navigational aid apparatus and radio remote control apparatus.
雷达设备、无线电导航设备及无线电遥控设备。
2.The navigational aid the pilot was following was valid, but not for the landing procedure at Cali.
飞行员遵守的指示是没有错的，只不过这个指示不是用来在卡利降落而已。
3.Holding airspace is usually established over the navigational aid;
等待空域通常划设在导航台上空；
4.Radar, navigational aid and communication device
雷达、导航设备及电讯装置