That device would be a compass!
That device would be a compass!
the compass
Band
It was the only reliable and "high tech" source of direction.
compass
piano
compass
The sextant and the clock.
an instrument used by sailors to determine their location by observing the positions of stars
the compass. it was a very useful invention for European sailors.
A compass was invented by the Chinese and was very useful to the sailors.
Astrolabe or Sextant