Stealth GPS Logger - Save yourself from Speeding Tickets / Parking Tickets?

**MoFo** · 04-28-2005, 10:43 PM

Originally Posted by 0l33l

So did you gett those 15mph subtracted?

nah, that was my first court case and they dicked me on that one. I was 16 and stupid me did trial by judge instead of jury. Turns out the judge and the district attourney were golf buddies so the judge would always side with him and overrule my legitimate objections.

I should have obtained a copy of the radar gun's owners manual (which is public information) and cross-testified the hell out of that cop until it became obvious that he has no idea about the various flaws with his radar gun and then motioned for dismissal due to incompetent witness. Might have worked with a jury if i made enough reasonable doubt

**0l33l** · 04-28-2005, 10:55 PM

Originally Posted by MoFo

nah, that was my first court case and they dicked me on that one. I was 16 and stupid me did trial by judge instead of jury. Turns out the judge and the district attourney were golf buddies so the judge would always side with him and overrule my legitimate objections.

I should have obtained a copy of the radar gun's owners manual (which is public information) and cross-testified the hell out of that cop until it became obvious that he has no idea about the various flaws with his radar gun and then motioned for dismissal due to incompetent witness. Might have worked with a jury if i made enough reasonable doubt

That's too bad

The owners manual sounds like a good way of attack

I always get these looks from cops. It ain't stolen yo!

**Curiosity** · 04-28-2005, 11:13 PM

Another trick they do is tap the brakes when they have moving radar. As it's calculating the speed between the two cars then subtracting the cop's speed, they slow down a little so it adds a few MPH to the final output. Cops tap the brakes all day long just to keep in practice. Owners manuals are great too. Check out the sections on interference and how long it has to be locked to get an accurate reading. Some of them don't even know what locking means.

**pate60** · 05-03-2005, 07:47 AM

Yeah well my much loved skyline has been sold now, i've come to the UK on my OE, probably gotta pick up a r34 GTR or GTT at least on the way home.

**justintime** · 09-29-2005, 09:48 PM

talk about a thread going off topic. Common guys, is there an app that can write a log of all NMEA data, or not?!

**tj!2k4** · 09-29-2005, 10:07 PM

yes, there are apps that will log data from a serial port to a file (because that's basically what we're talking about here), but they either have a crappy graphical ui and have to be started manually, or they want $100 for a command line version. bah.

i was looking into doing this with Perl, but haven't had much time to muck with it yet.

**justintime** · 09-29-2005, 10:12 PM

The best thing I have found is this GPSTracker software.

But it is not polished, and has to be started manually like you said.

I love how you can upload the XML file it generates to a couple web services, and it will generate an animated/graphical representation of your trip!

**Don 944 LA** · 09-30-2005, 01:53 AM

There are many GPS loggers...
and yes, if you have a CD/DVD burner, you could burn a copy as you are waiting forever for the cop to give you the ticket.
I'm sure that no one would figure out the hex for replacing the log and be exact enough.... just to get out of a ticket....

As a P-Car driver, I rely on my detector... I routinely have the cops behind, they don't like that I have a Euro plate and a Calif. plate.. so they run the plate ( CA one of course

).. If I need to submit the log as evidence, it wouldn't be to get out of a speeding ticket, but something more intense.....

Don

EDIT: and I drive 3 digits whenever possible

max is 124 on the freeway, but I stay under 110 lately.

**CdRsKuLL** · 09-30-2005, 02:59 AM

I havent looked at the whole thread, but if it hasnt be explained then I will have a bash.. the checksum at the end is used to check that the infomation in the nmea line is correct and hasnt changed. This is to make sure that the data recieved is all good. The checksum is just made up by adding all the pairs together and then subtracting it from a high hex number.. something like 1000 if I remember rightly then just using the last two digits of that number.. so if you wanted to make your own nmea line up this its very easy to do.

CdR

**zPilott** · 10-04-2005, 07:56 AM

Originally Posted by CdRsKuLL

I havent looked at the whole thread, but if it hasnt be explained then I will have a bash.. the checksum at the end is used to check that the infomation in the nmea line is correct and hasnt changed. This is to make sure that the data recieved is all good. The checksum is just made up by adding all the pairs together and then subtracting it from a high hex number.. something like 1000 if I remember rightly then just using the last two digits of that number.. so if you wanted to make your own nmea line up this its very easy to do.

CdR

Actually, it is the exclusive or of all the characters between the $ and the * (for NMEA, you might be talking about some orther protocol).

I am working on a program to dump the gps stream to a file, i can post it if people are interested.