Navigation Instruments
Inertial navigation system - Wikipedia
Navigation Methods
Can you name 10 tools we used to navigate the seas before ECDIS? - Martek Marine
4 Ways to Use a GPS - wikiHow
Vintage Navigation Equipment
Radio navigation - Wikipedia
Navigation Instruments
Sigurd's Marriage and Brynhild's Betrayal (Andvari's Curse, Part VII)
Sextant - Wikipedia
Kamal (navigation) - Wikipedia