sextant

Unlike decimal coordinates, which you can determine using a sextant and a chronometer, you cannot determine UTM coordinates without calculations.

十进制坐标可通过一个六分仪和一个记时计确定，与此不同的是，必须通过计算才能确定 UTM 坐标。

I can see all the traditional signalling flags neatly stowed on shelves on the bridge—so neatly, in fact, that I suspect they might never have been used, together with the sextant, the flares.

我可以看见所有传统的信号旗整齐地装载在桥架上-如此整洁，事实上，我怀疑它们和六分仪及闪光信号一样，可能从未被用过。