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Navigation system accuracy ?

8K views 17 replies 13 participants last post by  Bill Merchant 
I compared the Nav system's GPS to a military PLGR unit, and it was accurate within about 85 feet in pure GPS mode. THis was with a clear southern sky view, and after averaging for several minutes. This is about as good as pure civilian GPS gets, claims to the contrary.

Coupled with maps, wheel turn sensor, and the rate gyro, it can do much better than that. The maps (other than the address estimations) are more accurate than the GPS, so the more snapping is done, the better the accuracy. In urban areas that have provided data, the "75 foot" mode shows outlines of buildings that includes accuracy measured in single digits (feet). The more you turn, the better it can map-match, and the more accurately the system can place you on the maps.

Blocked GPS signals, close parallel roads, long stretches without turns all can degrade both location and direction accuracy. And as noted, the address-estimation is not very good, expecially in non-urban areas. However, using GPS to get a fix and enter a memo point, it will rely on the GPS coordinates, not the address estimation, next time it guides you there.
 
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