Using TMC in Garmin nuvi for free

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

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.

Quote:

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Originally Posted by angelozip [Only registered and activated users can see links. Click Here To Register...]

No, many other GPS models are on the list of compatibility of Garmin page, just take in the acquisition sequence to check the signature. Will be asked for ID of the GTMxx and the code signature is given automatically. From what I could check in this list, some GPS models are compatible with the GTM20, but there is the possibility of it not working if you use it in another model off the list, because some GPS firmwares can not handle some parameters (as ecc) of some types of signatures. If your intention was just to get the parameters of the official Garmin to study it, I can save work for you: 30721,1,1. I find very curious that in Portugal, with Garmin Traffic Free service, no signature is required and no configuration, tuning is automatic (no providers and parameters in trafficproviders.xml). .....

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Sorry to bump such old thread.
I have a new to me Nuvi 3597 with gmt36 and I am living in portugal.
Device is updated both with express (latest firmware 5.50 and CN 2025 europe maps) and webupdater.
Traffic doesn't seem to work.
Followed this

Spoiler: YT video

[Only registered and activated users can see links. Click Here To Register...]

with no sucess.
Does this service still work in Portugal?

edit: after many hours of search, apparently portugal doesn't have this service, and others will close in march next year

Code:

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https://www.garmin.com/pt-PT/traffic/

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Spoiler: small images

[Only registered and activated users can see links. Click Here To Register...] [Only registered and activated users can see links. Click Here To Register...] [Only registered and activated users can see links. Click Here To Register...] [Only registered and activated users can see links. Click Here To Register...]