navicert

例句：

1. 1. He received anavigation certificate for his new boat.
   他获得了他的新船的导航证书。
2. 2. The captain neededa navigation certificate to operate the ship.
   船长需要一张导航证书才能操作这艘船。
3. 3. Thepilot had to show his navigation certificate beforetaking off.
   飞行员在起飞前必须出示他的导航证书。