用“navigation aid”造句大全，navigation aid造句

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.

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;