【电】 长途航行辅助

long distance navigation computer Gee navigation aid ground navigation aid long-distance call long-distance runner long distance guided communication long distance teaching long distance transmission long distance telephone long distance cruiser long distance radio station long distance radiostation long-distance navigation navigation aid self-contained navigation aid electronic aid to navigation radio navigation aid instrument radio aid to navigation self-aid navigation air navigation aid visual aid to navigation ground-based navigation aid aid to navigation