1. Navigational instruments, Hygrometers, Sextants

2. Including magnetic compasses, sextants, Alidades and peloruses

3. Including magnetic compasses, sextants, Alidades and peloruses

4. Aye, maybe you’re a crack hand with sextants and Aerology.

5. But sextants and clocks weren't useful unless sailors could use these tools to determine their position.

6. Nautical and navigational instruments and apparatus, in particular directional compasses, sextants, barographs, navigational reckoning implements

7. Thankfully, three inventions made modern navigation possible: sextants, clocks and the mathematics necessary to perform the required calculations quickly and easily.

8. There are many who insist that the paradigms of greed, arrogance and usurpation are the true reference points for our sextants.