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A comment on First Map-Based Car Navigation System Debuted 14 Years Before GPS. Parent comment

Re:First Map-Based Car Navigation System Debuted 14 Years Be... by helb on Tuesday April 11, 2017 @10:20AM (#14088000)
Something similar is often used for railway lines. Even Wikipedia has it on some pages, eg. https://en.wikipedia.org/wiki/Great_Eastern_Main_Line
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