Radio AtoN, Radar, Gyro compass, Global Navigation Satellite System ( GNSS ), Electronic Chart Display and Information System ( ECDIS ), Automatic Identification System ( AIS ), etc. have been applied to a large extent to ensure safety of navigation. 无线电航标、雷达、电罗经、全球导航卫星系统(GNSS)、电子海图显示与信息系统(ECDIS)、船舶自动识别系统(AIS)等的相继应用,在很大程度上保证了航海安全。