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.30calSolution wrote:

jimlongley wrote:On GPS, I was traveling all the time a couple of years back, a new rental car every week, sometimes even twice a week, and I used my GPS to check Speedometer accuracy, and they were all over the map, from 7 under to 5 over. None farther than that, but it was NEVER right on.

The new ones are accurate within 1m anywhere it has satellite contact, they also show your lat & longitude. I would expect that they are very accurate as long as you don't quickly accelerate/decelerate. Mine also shows what sat you are connected to and where it's located in the sky above, it's not an expensive model either. Big brother has been using them for many years and our military uses them daily, they land helicopters on dimes in sandstorms. All I know is that GPS proof holds up in court. I will try and dig it up later. I'm hitting the bed for now.

Sorry, I should have made it clear, it was the accuracy of the speedometers I was impugning, not the GPS. I have been using GPS in one form or another since it first became available over 15 years ago, starting with applications that were only available to telecomm companies.

On GPS, I was traveling all the time a couple of years back, a new rental car every week, sometimes even twice a week, and I used my GPS to check Speedometer accuracy, and they were all over the map, from 7 under to 5 over. None farther than that, but it was NEVER right on.

I used to live in upstate NY and race at Lebanon Valley Speedway. Between "The Valley" and the Albany NY area on route 20 is the little village of Nassau, and it was a speed trap. 55mph approaching the village, but the village was 30, and no real warning of the drop. If you didn't know it was coming, you got caught.

To make matters worse, the local cop was REALLY named Earp.

He stopped me for 60 in a 30 zone once, I was on my way from the diner to another part of the village, and was within the 30 zone the whole time, but I had been drag racing that day and still had numbers in soap on the windows. I was taken to the JP (I actually had to drive my car under "escort") and when I pointed my car out, a rust bucket 58 Plymouth wagon, and questioned whether I could have made it all the way up to 60 in the distance from the diner to the stop sign (where Earp "caught" me) and get stopped for it. No radar in the car, and NY State law required a full 1/4 mile clock for a valid stop. The JP threw me out with a warning to not get caught again.

Funny thing was that with my car tuned for the drags, I could easily make it to 60 and back before the stop sign, so Earp might have been right, but the JP didn't think the car would do it, and knew that Earp didn't have a valid clock.

I was one of the few kids ever to beat an Earp ticket.