Using TMC in Garmin nuvi for free

**Butters** · 19th May 2019, 10:10 PM

@unsermeister
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.

**minetraps** · 24th April 2020, 11:54 PM

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">
......
<provider>
<providerName>HERE Traffic (DE)</providerName>
<providerCopyright>HERE Traffic. Copyright HERE</providerCopyright>
<pay>true</pay>
<tuning ltn="1" sid="50"/>
</provider>

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

Therefore...
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".

**Izam** · 13th September 2020, 02:48 AM

Hi All,

I am using a DNX4150BT but the "Traffic->Subscriptions" options seems to be grayed out.
Through Garmin Express, the TrafficProvider.xml was updated to v4.9 but i can't seem to get any traffic info.

Is there anything that I should try to get the traffic working?

**Boki** · 13th September 2020, 09:48 AM

[Only registered and activated users can see links. ]
INRIX Traffic with 2 years trial

Is it a free service in Singapore?

**Izam** · 13th September 2020, 10:16 AM

TMC via FM is supposed to be free but somehow not working for me even after updating the Xml through Garmin Express.

[Only registered and activated users can see links. ]
Oh the SG version of our manuals/features mentioned nothing about INRIX though..

Originally Posted by alicantor

Did you activate the tools/settings/navigation/avoidance/traffic option ?

Tried this one too but didn't see any change..

Originally Posted by greekislandlover

Hi, I think I give up at this point!

Pasta 1 went on and it updated. Loaded pasta 2, and it hasn't recognised it has a traffic cable since. Done a hard reset just to see if that helps. No amount of twiddling the cable makes it appear as a traffic module....

Hi All, To add on, I entered debug mode of the DNX4150BT (6 seconds of long press at the speedometer) and this was also all I saw.
My trafficprovider.xml is version 4.90 already, so wondering what could be the problem why the traffic is not coming in (SG).

**Boki** · 28th September 2020, 06:16 AM

Maybe a different frequency range...
The module may be defective...
etc...

**asprin624** · 28th September 2020, 09:44 AM

Built-in Garmin Navigation Engine

Has it ever worked?
Seeing it is a Garmin system have you contacted them?
Also did you check all your cables are connected good?

Equipped with the 12V industry standard Garmin navigation system,
offering a variety of display options like "Junction View with Lane Assist,"
"3D Building Map," "Intelligent Parking Assist," and "Traffic Information"* to make your driving easy.

*These functions may not be available in certain markets / countries.

Also this info:

Navigation

Navigation Systems

KENWOOD navigation systems show you the way to your destination as well as all the information you need along the way.
Powered by Garmin's cutting-edge navigation technologies, these navigation systems are easy to use while offering a clear, sharp display of maps.

Built-in TMC and optional Garmin Smartphone Link provide important traffic information and re-routing to avoid congestion.
Our DNN connected models include 2-year free INTRIX traffic via your smartphone.

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