Re: Speedometer error

Tegger wrote:
Dillon Pyron <invaliddmpyron@xxxxxxxxxxxxx> wrote in
news:gbjhg5taanhs2lvgc7jktvs0grhlf8t59v@xxxxxxx:

Thus spake Tegger <invalid@xxxxxxxxxxx> :


GPS's are not definitively accurate. There is a fairly large built-in
error in all GPS's. GPS satellites are the property of the US
Department of Defense, and the military doesn't want you having the
same thing they've got for reasons of national security. This is
outlined in all the new-car PDI docs issued by Honda for vehicles that
have NAVI.
Way incorrect. SA/CA went out long ago. During Desert Storm they had
to disable it because the DoD couldn't get enough MilSpec GPS units
and was buying civilian units from Magellan.



Then how come all the 2010 PDI docs say this?:

"The GPS (global positioning system) satellites used by the navigation system are operated by the U.S. Department of Defense. For security reasons, certain inaccuracies are built into the GPS. This can cause occasional positioning errors of up to several hundred feet. If the navigation system indicates your position incorrectly, wait several seconds until it corrects itself. The system may also correct itself after you make a turn or cross a road."

If your reported location is incorrect, then it stands to reason that reported distances may be incorrect as well.



Considering that my GPS's both know exactly where my house is, and tell me to turn the wrong way at the end of my driveway onto the north/south road that runs in front of my house, I gotta think there's some merit to this.
.

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