An intersection in my town just converted from a 4 way light to a roundabout, and the gps was changed to reflect within a week. Who does this and how???
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Depending on the GPS service you use, older stand-alone devices that dont connect to the internet would have to be manually updated by either a memory card with updates on it or be connected to a computer.
Internet based GPS, like the kind on your phone or in your car would be able to pretty much update by itself or tell you when an update is available.
For those internet-based GPS maps, sometimes it is up to users to send in update reports to their respective map GPS services. You can report road closures, construction closures that make a street one-way, new bike path, roads that were demolished and will not be replaced, errors in the way the app makes directions for you to follow, and many other reasons.
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