“navigation aid”簡單造句，navigation aid造句子

ground radio navigation aid

Gee navigation aid

Setting up any lighting or sound devices affecting navigation safety in the vicinity of a navigation aid in violation of Article 11 of the Regulation on Navigation Aids;

If navigation aids or navigational facilities malfunction or become abnormal;

Some 17 traffic-control systems have been established, 300 navigation aids set up or upgraded, and 20 RBN-DGPS stations in coastal ports and crucial waters established, basically achieving the target for completing the nation's navigation aid chains.