Hackolog
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It might seem a little low-tech, but since it can help you read directions from Google Maps, this steampunk style wristlet seems pretty cool.

Google Maps with Scrolling Brass Wristlet

This is a navigation system that delivers your route in the way proclamations were read back in ancient Rome or rally notes were read at the advent of the sport. The brass, leather and glass wristlet needs no batteries and couldn’t be easier to use. Simply turn one of the knurled knobs to move the scroll.

The body itself is all hand soldered from modeling tube while the ends are also made with brass. The knobs on the end were made from acorn nuts and a piece from a binding post screw.