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bassman5911:

Plus Fours Routefinder - Worlds First Navigation System

Invented in 1920′s this could be world’s first navigation system. No satellites or digital screens were used in the making of this portable navigation system. Called Plus Fours Routefinder, this little invention was designed to be worn on your wrist, and the “maps” were printed on little wooden rollers which you would turn manually as you drove along.

(via avaxnews)

iWatch, eat your heart out.

Genius!

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  3. stillbuildingabetterme reblogged this from parislemon and added:
    This is wonderful!
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    The only “smartwatch” I’ve seen so far that I’d consider wearing.
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