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Navigation system accuracy ?

8K views 17 replies 13 participants last post by  Bill Merchant 
It's also worth noting that the navi system (and, indeed, most navi systems in cars) *intentionally* stops guidance quite a ways before you get to your destination. This is because the designers recognize the possibility of error, not so much in the GPS as in the address data, and therefore want to get you looking for your destination before the system thinks you're actually there.

If you look at the right-hand split panel, it will show the distance the system thinks you are from your destination, even after you have "arrived". It usually starts somewhere around 3-500 feet in my experience, even when the "distance to target" is dead on.

I would tend to attribute most of the error to the map data, actually. GPSs have gotten really good and really cheap over the last several years, and should be able to do <100 feet easily, and <50 feet most of the time.
 
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