6:22

Experiments in Viking Navigation Viking Sun Stone

13:02

Vegvísir (wrongly called "Viking Compass")

3:57

Every Genius Detail That Made Viking Longships Remarkable

7:16

Sextant Tutorial: The Principle of the Sextant

12:13

Sunstone Crystal Mining | Spectrum Public Mine in Oregon

9:26

Mystery of Oregon’s sunstones | Oregon Field Guide

4:58

What's so special about Viking ships? - Jan Bill

9:51

Viking Sunstone Accurate As A Magnetic Compass! | Expedition Unknown