GPS Adjustment
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Does anyone know if the GPS system can be honed to accuracy by the dealer in SW updates. I used to get pinpoint directions when I was in Europe but ever since US delivery and subsequent SW updates, I get the "You have arrived" either 300ft early or I have to drive 300ft past my destination.
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Originally Posted by Hormazd' date='Mar 16 2005, 02:41 PM
Does anyone know if the GPS system can be honed to accuracy by the dealer in SW updates.? I used to get pinpoint directions when I was in Europe but ever since US delivery and subsequent SW updates,? I get the "You have arrived" either 300ft early or I have to drive 300ft past my destination.
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Keep in mind that the Nav's accuracy is inversely effected by the Homeland Security alert level.
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Originally Posted by beewang' date='Mar 16 2005, 12:51 PM
[quote name='Hormazd' date='Mar 16 2005, 02:41 PM']Does anyone know if the GPS system can be honed to accuracy by the dealer in SW updates.?? I used to get pinpoint directions when I was in Europe but ever since US delivery and subsequent SW updates,? I get the "You have arrived" either 300ft early or I have to drive 300ft past my destination.
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Keep in mind that the Nav's accuracy is inversely effected by the Homeland Security alert level.
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[/quote]Thanks Bee, Good point, The US DVD is one variable I forgot to factor in.
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Don't know if this applies or not, but I have read elsewhere in connection with handheld units (used for hiking or other outdoor activities) that all civilian GPS is intentionally inaccuate by some % as a "security" measure. Only the military gets 100% accuracy.
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Originally Posted by robg' date='Mar 16 2005, 08:59 PM
Don't know if this applies or not, but I have read elsewhere in connection with handheld units (used for hiking or other outdoor activities) that all civilian GPS is intentionally inaccuate by some % as a "security" measure.? Only the? military gets 100% accuracy.
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Originally Posted by beewang' date='Mar 16 2005, 05:40 PM
[quote name='browellm' date='Mar 16 2005, 03:24 PM']The intentional degradation of civilian GPS was removed on May 1 2000.
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[/quote]Mine is off, too. I also have a Garmin handheld GPS, which I had with me in the car and it was NOT off. The BMW NAV had me on another (parallel) street, while the Garmin had it right. So it must be the BMW hardware or the map software.
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Originally Posted by browellm' date='Mar 16 2005, 05:53 PM
Ah right.? My understanding is also that the US Government can regionalise that degradation, which would explain why it is pretty much "bang on" here.
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Since the position information that Hormazd got was correct before shipping to the US from Europe, I'd agree that the likely cause is map-related and not GPS-related.
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Originally Posted by browellm' date='Mar 16 2005, 03:24 PM
[quote name='robg' date='Mar 16 2005, 08:59 PM']Don't know if this applies or not, but I have read elsewhere in connection with handheld units (used for hiking or other outdoor activities) that all civilian GPS is intentionally inaccuate by some % as a "security" measure.? Only the? military gets 100% accuracy.
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[/quote]Even though there is no intentional degradation now, the military still has encrypted and higher resolution codes not available to the civilian world. Weapons targeting requires far more accuracy than what we get in the commercial world. However, starting with GPS IIR-14 (M), scheduled for launch on 20 May 2005, the civilians will get an additional code/frequency to help resolve ionospheric errors and improve accuracy. The Military gets new codes, anti-jamming and enhanced encryption. Both get an increase in power which should help those in marginal coverage areas. However, just the launch of this satellite will not enable these improvements. It will take many more satellites to enable all these enhancements to be utilized as you need at least three in view at all times at any given receiver. That will take a few years. We'll probably only get three up this year at best.
As far as accuracy now is concerned, it is based on how much processing power the ground receiver has. Some are capable of processing more satellites that others. As you increase the number of satellites in view and are capable of processing their data you can obtain greater accuracy. The GPS Program Office produces a map showing the number of satellites in view over the earth and the expected accuracies that can be achieved. It is something I might be able to download at work.