The Smartwatch of the 1920s

[RJBowman]

Link:
https://gajitz.com/scrolling-down-the-highway-vintage-1927-analog-gps/

Photo:


A device for viewing tiny maps printed on scrolls of paper. Each scroll showed the route between two cities or landmarks.

How useful was it? It never caught on. Still, it's an appealing item for a steampunk setting where not everything is completely practical.