Page 1 of 3 123 LastLast
Results 1 to 10 of 21

Thread: Speed Record Against Police - Black Box

  1. #1
    Newbie
    Join Date
    Dec 2006
    Posts
    8

    Speed Record Against Police - Black Box


    Which software for a CAR COMPUTER can have this option:

    can record (via a bluetooth GPS) for a time or a router planner all speed take by our car and make also a grafic analysis?
    Maybe this can be useful when police (specially in some east countries) stops you saying your speed limit was over.

    I see G-NET Digital Dash but I don't know if this is included, otherwise where I must find and how.

    Thanks in advance.

    Sullivan2002 from Italy.






  2. #2
    Calm
    Down
    Or
    Get
    A
    2
    Week
    Vacation
    -Love
    The
    Forum
    Policeman
    Wiredwrx's Avatar
    Join Date
    Jan 2003
    Posts
    3,605
    I am not sure about in Italy, but here in the US, that type of evidence would not be very strong, because the data can be EASILY manipulated to be false.

    I know that IGuidance has the ability to record a trip including speed, which can be played back in IGuidance. I have a feeling MOST GPS software allows that.

    Michael
    ...I love the French language...especially to curse with...Nom de Dieu de putain de bordel de merde de saloperies de connards d'enculés de ta mère. You see, it's like wiping your *** with silk, I love it.

  3. #3
    Confusion Master
    Auto Apps:loading...
    Enforcer's Avatar
    Join Date
    Sep 2003
    Location
    If you go down to the woods today, You're sure of
    Posts
    14,581
    FreeDrive using the destinator back end can log journeys.

    But anything that can record an NMEA data string should be sufficent.

    And I don't think NMEA data can 'easily' be manipulated to change speed or positions that will make it readable.

  4. #4
    Calm
    Down
    Or
    Get
    A
    2
    Week
    Vacation
    -Love
    The
    Forum
    Policeman
    Wiredwrx's Avatar
    Join Date
    Jan 2003
    Posts
    3,605
    Quote Originally Posted by Enforcer View Post
    FreeDrive using the destinator back end can log journeys.

    But anything that can record an NMEA data string should be sufficent.

    And I don't think NMEA data can 'easily' be manipulated to change speed or positions that will make it readable.
    Just enter the NMEA string into excel, run a script on the data to change location on it to show you were going slower then you were cited for, and then save it back into an NMEA string, and play it on your "player"

    See, it is easy. An NMEA sentance

    (http://www.gpsinformation.org/dale/nmea.htm#position)

    " $GPGGA,123519,4807.038,N,01131.000,E,1,08,0.9,545. 4,M,46.9,M,,*47

    Where:
    GGA Global Positioning System Fix Data
    123519 Fix taken at 12:35:19 UTC
    4807.038,N Latitude 48 deg 07.038' N
    01131.000,E Longitude 11 deg 31.000' E

    1 Fix quality: 0 = invalid
    1 = GPS fix (SPS)
    2 = DGPS fix
    3 = PPS fix
    4 = Real Time Kinematic
    5 = Float RTK
    6 = estimated (dead reckoning) (2.3 feature)
    7 = Manual input mode
    8 = Simulation mode
    08 Number of satellites being tracked
    0.9 Horizontal dilution of position
    545.4,M Altitude, Meters, above mean sea level
    46.9,M Height of geoid (mean sea level) above WGS84
    ellipsoid
    (empty field) time in seconds since last DGPS update
    (empty field) DGPS station ID number
    *47 the checksum data, always begins with *"

    Change the position (green) to show a different location that indicates you were moving slower then claimed by the officer, or change the time (red) to make it seem it took longer to get to that position.

    Just takes some manipulation. Seee, easy.

    Michael

    EDIT: Oooops, forgot about the checksum. From that same site

    "There is a provision for a checksum at the end of each sentence which may or may not be checked by the unit that reads the data. The checksum field consists of a '*' and two hex digits representing the exclusive OR of all characters between, but not including, the '$' and '*'. A checksum is required on some sentences. "

    Not all units need the checksum, and it can be generated quite easily, all it is is the total number of characters excluding the commas and the "$" and "*"
    ...I love the French language...especially to curse with...Nom de Dieu de putain de bordel de merde de saloperies de connards d'enculés de ta mère. You see, it's like wiping your *** with silk, I love it.

  5. #5
    Confusion Master
    Auto Apps:loading...
    Enforcer's Avatar
    Join Date
    Sep 2003
    Location
    If you go down to the woods today, You're sure of
    Posts
    14,581
    Quote Originally Posted by Wiredwrx View Post
    Just enter the NMEA string into excel, run a script on the data to change location on it to show you were going slower then you were cited for, and then save it back into an NMEA string, and play it on your "player"

    See, it is easy. An NMEA sentance

    (http://www.gpsinformation.org/dale/nmea.htm#position)

    " $GPGGA,123519,4807.038,N,01131.000,E,1,08,0.9,545. 4,M,46.9,M,,*47

    Where:
    GGA Global Positioning System Fix Data
    123519 Fix taken at 12:35:19 UTC
    4807.038,N Latitude 48 deg 07.038' N
    01131.000,E Longitude 11 deg 31.000' E

    1 Fix quality: 0 = invalid
    1 = GPS fix (SPS)
    2 = DGPS fix
    3 = PPS fix
    4 = Real Time Kinematic
    5 = Float RTK
    6 = estimated (dead reckoning) (2.3 feature)
    7 = Manual input mode
    8 = Simulation mode
    08 Number of satellites being tracked
    0.9 Horizontal dilution of position
    545.4,M Altitude, Meters, above mean sea level
    46.9,M Height of geoid (mean sea level) above WGS84
    ellipsoid
    (empty field) time in seconds since last DGPS update
    (empty field) DGPS station ID number
    *47 the checksum data, always begins with *"

    Change the position (green) to show a different location that indicates you were moving slower then claimed by the officer, or change the time (red) to make it seem it took longer to get to that position.

    Just takes some manipulation. Seee, easy.

    Michael

    EDIT: Oooops, forgot about the checksum. From that same site

    "There is a provision for a checksum at the end of each sentence which may or may not be checked by the unit that reads the data. The checksum field consists of a '*' and two hex digits representing the exclusive OR of all characters between, but not including, the '$' and '*'. A checksum is required on some sentences. "

    Not all units need the checksum, and it can be generated quite easily, all it is is the total number of characters excluding the commas and the "$" and "*"
    To change one single record is easy. However to change a whole stream to a different speed and have it still make sense would not be easy, believe me it is something I have thought about.

  6. #6
    Calm
    Down
    Or
    Get
    A
    2
    Week
    Vacation
    -Love
    The
    Forum
    Policeman
    Wiredwrx's Avatar
    Join Date
    Jan 2003
    Posts
    3,605
    Quote Originally Posted by Enforcer View Post
    To change one single record is easy. However to change a whole stream to a different speed and have it still make sense would not be easy, believe me it is something I have thought about.
    What was the hard part about it.

    One could simply drive the same route, at the proper speed, and then just change the date and time stamp (again, with excel, this is VERY EASY, and actually, that string doesn't include a DATE stamp, just a time stamp) to show you did it by the book.

    No need to figure out "positions, lats and longs" because you already have them, either from that trip, or form another NMEA string.

    Michael
    ...I love the French language...especially to curse with...Nom de Dieu de putain de bordel de merde de saloperies de connards d'enculés de ta mère. You see, it's like wiping your *** with silk, I love it.

  7. #7
    Confusion Master
    Auto Apps:loading...
    Enforcer's Avatar
    Join Date
    Sep 2003
    Location
    If you go down to the woods today, You're sure of
    Posts
    14,581
    Quote Originally Posted by Wiredwrx View Post
    What was the hard part about it.

    One could simply drive the same route, at the proper speed, and then just change the date and time stamp (again, with excel, this is VERY EASY, and actually, that string doesn't include a DATE stamp, just a time stamp) to show you did it by the book.

    No need to figure out "positions, lats and longs" because you already have them, either from that trip, or form another NMEA string.

    Michael

    To do it at home after the fact yes and maybe, but to do it there and then when stopped, I think not.

    yes you have some already prepared, but to change to dates and times on the fly would be difficult.

    I didn't say it couldn't be done, but to do it in the time it takes for the officer to reach you after stopping the car, would be difficult.

  8. #8
    Calm
    Down
    Or
    Get
    A
    2
    Week
    Vacation
    -Love
    The
    Forum
    Policeman
    Wiredwrx's Avatar
    Join Date
    Jan 2003
    Posts
    3,605
    Quote Originally Posted by Enforcer View Post
    To do it at home after the fact yes and maybe, but to do it there and then when stopped, I think not.

    yes you have some already prepared, but to change to dates and times on the fly would be difficult.

    I didn't say it couldn't be done, but to do it in the time it takes for the officer to reach you after stopping the car, would be difficult.
    True, I was thinking more along the lines of court, since no officer is gonna stop giving a ticket just because you show them a GPS track that says you were going slower.

    Now, doing it instantly would take some work, but could probably be done if the route was continuously saved, say every 2 minutes, and automatically reworked in excel using a script and say, AutoIt, but I don't think it would be practical, and would take a lot more work then would just fighting the ticket in court using the "corrected" information.

    Michael

    EDIT: I guess I have a project for tonight and tomorrow. Just got to make sure I can get the raw NMEA data on the way home tonight. Hmmmmm, we'll see.
    ...I love the French language...especially to curse with...Nom de Dieu de putain de bordel de merde de saloperies de connards d'enculés de ta mère. You see, it's like wiping your *** with silk, I love it.

  9. #9
    Confusion Master
    Auto Apps:loading...
    Enforcer's Avatar
    Join Date
    Sep 2003
    Location
    If you go down to the woods today, You're sure of
    Posts
    14,581
    Quote Originally Posted by Wiredwrx View Post
    True, I was thinking more along the lines of court, since no officer is gonna stop giving a ticket just because you show them a GPS track that says you were going slower.
    Don't you always

    I don't know, if they are deliberatley scamming/hassling you then they may feel on shakey ground if there is a possible way you can prove them wrong.

    If their equipment has been checked within the required time period, and acoording to it you were over the speed limit, then no it will not stop them.


    Good luck with the project.

  10. #10
    Low Bitrate
    Join Date
    Nov 2006
    Posts
    98
    The key is to have a camera and voice recorder in your car. Get a shot of the data as the cop is coming up and make sure your on record disputing it and showing evidence to the officer. I can imagine that would hold up a lot better than data you came up with by your court date.

Page 1 of 3 123 LastLast

Similar Threads

  1. FS: New in Box 7'' Black Lilli VGA Touchscreen
    By wonderworm in forum Classified Archive
    Replies: 7
    Last Post: 01-09-2005, 07:07 PM
  2. FS: New in BOX All Black 7'' Lilliput VGA Touchscreen
    By wonderworm in forum Classified Archive
    Replies: 5
    Last Post: 11-12-2004, 11:58 PM
  3. FS: New in Box 7'' Touchscreen LIlliput, Black
    By wonderworm in forum Classified Archive
    Replies: 4
    Last Post: 10-16-2004, 04:10 PM
  4. Case design for a stowage box.
    By nibix in forum Fabrication
    Replies: 3
    Last Post: 07-10-2004, 05:12 PM
  5. BMW pre-installed system - TFT ?
    By tsingsu in forum LCD/Display
    Replies: 11
    Last Post: 08-05-2002, 02:16 AM

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •