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  1. #741
    Junior Member
    Join Date
    May 2019
    France, Normandy
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    Can anybody re-ulpload the file?
    [Only registered and activated users can see links. ]
    I cannot download it. Also, I'm not sure to use it as I have a nuvi 255.
    Last edited by unsermeister; 19th May 2019 at 06:32 PM.

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  3. #742
    Master Butters's Avatar
    Join Date
    Jul 2017
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    The Jetmouse link in the first post seems to work now.

    Your device has traffic capability. The first 2 screenshots at the top of initial post seem to be of a nuvi 265 using traffic in fact.

  4. #743
    Junior Member
    Join Date
    Mar 2017
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    I don't own a Garmin, but have been doing a lot of research and though I would share.

    Keyword explanation:
    CC = country code (available in TrafficProviders.xml)
    SID = service ID (available in TrafficProviders.xml)
    SVK = service key (number from 0-8 inclusive, 0 means no encryption, 1-8 refer to predefined encryption tables - you can experiment to see what works)
    LTN = location number number (available in TrafficProviders.xml)
    TransmittedLTN = transmitted location table number (usually the same as LTN)

    Calculating values:
    FID = SID | (CC << 8) | (SVK << 12) [bitwise operations]
    PID = LTN
    RgnID = TransmittedLTN
    VenID = 1 (add) or 0 (remove)

    Example: (TMCPro/HERE Germany)
    Note everything here is expressed in decimal.

    <country name="Germany" cc="13" ecc="224" fmTuningGrid="World" dab="DE">
    <providerName>HERE Traffic (DE)</providerName>
    <providerCopyright>HERE Traffic. Copyright HERE</providerCopyright>
    <tuning ltn="1" sid="50"/>

    CC = 13
    SID = 50
    SVK = 1 (can be guessed)
    LTN = 1
    TransmittedLTN = 1 (usually the same as LTN)

    FID = SID | (CC << 8) | (SVK << 12) = [Only registered and activated users can see links. ] = 7474
    PID = LTN = 1
    RgnID = TransmittedLTN = 1
    VenID = 1

    ....which matches what is on the 1st page.

    What about for a free service with no encryption?
    Same process but use a SVK value of 0.

    Why would LTN (PID) and transmitted LTN (RgnID) be different for a small number of providers? (ie. for France Via-Michelin & V-Traffic)
    A small number of providers do not encrypt their RDS-TMC location data, but instead choose to broadcast a "fake" LTN value (PID) that is not officially recognized by mapping data so a pre-defined mapping must indicate what the real LTN value is (RgnID) - this is also referred to as "conditional access".

    When both the PID and RgnID are the same and encryption is enabled (SVK is not zero), its referred to as "light encryption".
    Last edited by Boki_Srb; 30th April 2020 at 06:45 PM. Reason: approved



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