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Radar Gun vs. GPSr

 
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LucidOndine
Past MnGCA President


Joined: 17 Jan 2006

Posts: 1931

PostPosted: Fri Oct 26, 2007 3:23 pm    Post subject: Radar Gun vs. GPSr Reply with quote

I found this to be an interesting article, especially for certain WNC attenders whom speed through Iowa and have a certain knack for getting out of speeding tickets (I've seen him do it).

Anyway, enjoy.

http://arstechnica.com/news.ars/post/20071026-accused-speeder-to-cops-my-gps-proves-your-radar-gun-is-wrong.html
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GeoPierce
Geocacher


Joined: 16 Nov 2005

Posts: 1657

PostPosted: Fri Oct 26, 2007 3:29 pm    Post subject: Re: Radar Gun vs. GPSr Reply with quote

LucidOndine wrote:
I found this to be an interesting article, especially for certain WNC attenders whom speed through Iowa and have a certain knack for getting out of speeding tickets (I've seen him do it).

Anyway, enjoy.

http://arstechnica.com/news.ars/post/20071026-accused-speeder-to-cops-my-gps-proves-your-radar-gun-is-wrong.html

If his parents had to install a system like that to keep tabs on him, he's probably guilty. I like this quote too: "Malone's parents say that the data on the day in question shows that their son was not speeding in the vicinity of where the ticket was issued." They didn't say he wasn't speeding that day, just supposedly not speeding where he got caught. Smile
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LucidOndine
Past MnGCA President


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PostPosted: Fri Oct 26, 2007 3:31 pm    Post subject: Reply with quote

Who knew using a lowrance could get you out of a ticket Cool
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GeoPierce
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PostPosted: Fri Oct 26, 2007 3:39 pm    Post subject: Reply with quote

LucidOndine wrote:
Who knew using a lowrance could get you out of a ticket Cool

I'd rather pay the fine than get caught using a Lowrance. Smile
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Dances With Beehives
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Joined: 12 Sep 2003

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PostPosted: Fri Oct 26, 2007 3:52 pm    Post subject: Reply with quote

Quote:
I'd rather pay the fine than get caught using a Lowrance.


HAHAHAHAHhahahahh! Very Happy
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bflentje
Geocacher


Joined: 29 May 2006

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PostPosted: Fri Oct 26, 2007 8:28 pm    Post subject: Reply with quote

"can be up to 60 seconds between updates"

Hmm.. I think my Garmin processes an update every second or two.
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merkman
Past MnGCA Board


Joined: 03 Jun 2006

Posts: 2032

PostPosted: Fri Oct 26, 2007 8:47 pm    Post subject: Reply with quote

bflentje wrote:
"can be up to 60 seconds between updates"

Hmm.. I think my Garmin processes an update every second or two.



60 mph = 1 mile per min.
I don't think a gps track that has points 1 mile apart is very useful.
Not to mention waiting 1 min between updates would put a whole new spin on autorouting.
I think someone in the article has their facts mixed up.
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loneeagle_24
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Joined: 17 Jun 2003

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PostPosted: Sat Oct 27, 2007 12:41 pm    Post subject: Reply with quote

Should a person trust the GPS or the speedometer on your vehicle? Mine always seems to show that I am driving too fast. Shocked Seriously though, if my GPS shows I am doing 60 the speedometer on my truck will show like 58. I still have the original tires that were on it from the factory yet.
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merkman
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PostPosted: Sat Oct 27, 2007 1:47 pm    Post subject: Reply with quote

loneeagle_24 wrote:
Should a person trust the GPS or the speedometer on your vehicle? Mine always seems to show that I am driving too fast. Shocked Seriously though, if my GPS shows I am doing 60 the speedometer on my truck will show like 58. I still have the original tires that were on it from the factory yet.


I would say you were going 59 then Shocked Laughing
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Pear Head
Past MnGCA President


Joined: 04 Apr 2004

Posts: 5709

PostPosted: Sat Oct 27, 2007 4:14 pm    Post subject: Reply with quote

bflentje wrote:
"can be up to 60 seconds between updates"

Hmm.. I think my Garmin processes an update every second or two.


The system in the article appears to only update every 60 seconds, even if the GPS updates faster. This is probably because it's transmitting the data somewhere (likely to the internet). The transmit interval is 60 seconds, regardless of how often the GPS updates.

This allows for the user to be going at one speed during the update, then a faster speed between updates, then slowing down in time for the next update. The only thing it really proves is that he was going 45, and then 60 seconds he was going 45 again. Most people realize that 60 seconds is a long time - it's easy to accelerate beyond the speed limit and then slow back down for it again.
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TimbreWlf
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Joined: 14 Jul 2003

Posts: 347

PostPosted: Sun Oct 28, 2007 1:17 am    Post subject: Reply with quote

GPSR speed verification is a very long way from gaining acceptance within the courts. Traffic Radar on the other hand has been officially recognized and scientifically proven for 30 years. I will spare the rant that certain judges will make decisions contrary to precedence for publicity or just "sticking it" to law enforcement.

As a law enforcement doppler radar instructor for 20+ years I will tell you that that kid's old man is probably better served as a "former" law enforcement officer.

Don't expect this to fly for very long. Imagine this: You pay your toll and happen to get to the next toll booth a little too quickly - should you expect to receive a ticket from the attendant?
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Marsha and Silent Bob
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Joined: 02 Sep 2003

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PostPosted: Sun Oct 28, 2007 8:30 am    Post subject: Reply with quote

TimbreWlf wrote:
Don't expect this to fly for very long. Imagine this: You pay your toll and happen to get to the next toll booth a little too quickly - should you expect to receive a ticket from the attendant?

I was pulled over and cited by a Pennsylvania State Trooper when I was 17 or 18 (1996/1997?) for speeding between toll booths because the timestamps on the tickets for the tolls proved an average speed above 90 mph.

Now, I was speeding and was probably averaging well over the 90 mph they quoted and I never bothered to fight the ticket but I still thought it was a shady way to operate.
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