
Originally Posted by
bogan
Nah, getting Jesus to take the wheel won't help you either.
Consumer GPS reads have enough innacuracy that the positions must be averaged to get a speed reading, so no, it is not instantaneous. In fact if you pull out and boost passed someone then slow down, the GPS will never record your true maximum speed. Additionaly, GPS has much higher altitude inaccuracy due to the angle it sees the sats at, so will often not read correctly going up or down hills (good thing cops never sit at the bottom of hills though eh

). And finally, fucking with the GPS data is pretty easy, if one could successfully protest a ticked purely with their own gps data, revenues would plummet; unless of course you sent them a whole days worth of data by mistake, right?
Wifi to enable further accuracy? surely you're not suggesting further accuracy is needed or attainable? I thought GPS was already the gold-standard speed reading

It's close enough to instantaneous when the offence is rate of X kilometres per hour not nano metres per nano second.
GPS will record close enough to your true maximum speed obtained, even during a brief overtake. I've ran the free app google my maps on my budget $199 smartphone in mountainbike park and recorded true top speeds on there as per what the handlebar mounted cyclometer says also. And believe me those top speeds are very brief, much less time exposure than say blasting past a car at 140 on a passing lane.
They do read close enough to accurate speed up and downhill, the difference is negligible as far as measuring in kilometres per hour and would be in favour of the offender anyway. In fact one of NZ's major trucking companies has ordered its drivers not to even exceed 90k downhill even for the briefest moments before a climb.
If you want to fuck with gps data (called tampering with evidence at houses of higher repute than yours) go for it....
The other thing about protesting a ticket via GPS is that once you announce that the cops have the right to examine ALL the recorded evidence not what you select. Eg you could not turn up to a murder trial and only enter certain pages of your personal diary as evidence to defend yourself, you'd have to table the whole book or file. And with holding the rest would be grounds for cops to obtain a warrant to see what you don't want seen.
The case I mentioned earlier was all started (in my view, could have been other reasons) by a truck driver protesting that his GPS said 96 when he got radared at 98. This then gave the cops the heads up/right to come to the workplace and demand the GPS records for that truck. He ended up very lucky (the files showed over 300 alledged speed offences) that the cops stuffed up on some technical court matters in the way they entered the evidence and case got thrown out.
The further accuracy is not needed but will become part of normal systems as a back up to confirm existing data.
Oh well feel free to carry on speeding with you phone or other gps nav device enabled in bike or car, you'll find out next time you come to grief the facts about that evidence recorder your carrying around...
Every great cause begins as a movement, becomes a business, and eventually degenerates into a racket - Eric Hoffer
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