Aún no tenemos significados para "navigational instrument".
1After that he looked out the spaceports, and then through his navigational instruments.
2Navigational instruments, for finding your way back to Boston?
3Their skilled craftsmen made optical and navigational instruments and exported them all over the world.
4Since they had been coasting, they had had no navigational instruments other than a compass.
5"These are the normal navigational instruments," I replied, "and I'm familiar with their uses.