Besides low visibility, volcanic ash particles could cripple necessary navigational equipment.

除了能见度降低以外，火山灰颗粒还会损坏必要的导航设备。

In their small boats, they carried only rudimentary navigational equipment and limited supplies of food and water.

在他们的小船上，他们只带了简陋的导航设备和有限的食物和水。

When navigational equipment fails to respond?

当导航设备无法响应时？

Some of the ship's navigational equipment was missing, as well as a single lifeboat.

船上的一些导航设备和一艘救生艇都不见了。

An oblong crystal the size of a cigarette packet was found on a ship next to a pair of dividers, suggesting that it was part of the navigational equipment.

科学家在船只废墟中一对圆规旁边发现一块香烟盒大小的长方形水晶，表明这是航行设备的一部分。