Here's the system I was talking about. It used dead reckoning and landmarks (turns) to periodically re-calibrate the fix. This was all done with 80s technolog

Here's the system I was talking about. It used dead reckoning and landmarks (turns) to periodically re-calibrate the fix. This was all done with 80s technology. https://www.fastcompany.com/3047828/who-needs-gps-the-forgotten-story-of-etaks-amazing-1985-car-navigation-system https://www.fastcompany.com/3047828/who-needs-gps-the-forgot... Live demo: https://www.youtube.com/watch?v=CHCCjlSWbHE https://www.youtube.com/watch?v=CHCCjlSWbHE > Cheap dead reckoning sensors have so much error and drift right now as to be mostly useless for driving. I don't think anyone's saying that it would be used for the driving part (i.e. car control), just as an option for orienting the car in the wider world beyond its direct perception.