dry card compass

例句：

1. 1.We used a dry card compass to find our way back to the campsite.
   我们用干卡罗盘找到了返回营地的路。
2. 2. The old man used his dry card compass to navigate through the fog.
   那位老人用他的干卡罗盘在雾中导航。
3. 3. The map was so old that it had lost its magnetic properties, making the dry card compass useless.
   那张地图太旧了，失去了磁性，所以干卡罗盘已经没用了。