FREE: Navigate Like the Vikings

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This is the Sunstone. Used by the Vikings to Navigate when the sun wasnt out. Definately what they used for survival.
It is from Iceland. For those of you who have watched Vikings on the History channel They used this stone to find the sun when it was stormy and cloudy and they didnt know where they were cause they couldnt see the sun. Now I couldnt navigate by the Stars if my life depended on it but someone out there surely can. I havent had the type of weather to try it but I am waiting.
It maybe would help (ha as if anything would) during a volcanic or some awful terrible blackout.
Thank you for looking.