Thread: GTM36 and GTM26 problem with TMC on nuvi series 2xxx and 3xxx

I believe that is not being considered an important element in evaluating the functioning of GTM26 and 36: the subscription type. They are original Garmin subscription or generated by JetMouse? If they are original and are showing flaws in tune, should probably be bug, as reported in the previous post by lolypop, or some subtlety of the manipulation of firmware code.

If the signatures were generated by JetMouse, the problem lies elsewhere. I noticed has long a significant difference between the original signatures and those of the JetMouse in the GTM26, 36 and 60. In "GTM FM Table" (of 2595, 3490..) the original signatures appear complete with cc (country code), ecc (extend country code), Sid (service id) and Pid (ex. 12/a1/7/0). Happens that in JetMouse signatures, whatever it, the second field, the ecc, appears as 00 (see figure) in this GTMs, signifying that this signature does not include the ecc, or better, not equal the 4 parameters with those transmitted by radio TMC FM, in this case, for lack of ecc, or, ecc=00 (ex. 11/00/7/15), and not tunes.
This happens across the entire line of Garmin that uses the "new" operating system / browser 2012, as models 24x5, 25x5, 3400 and 3500.
In the current system of Garmin (new OS and GTMs) to the tune traffic signal and work properly there must be concordance and identification of cc/ecc/Sid/pid between 3 elements: 1. Operating System (OS gps new firmware); 2. The new firmware tuners of GTM 26, 36, 60 and 3. Radio station frequency RDS TMC that also radiate cc/ecc/Sid/Pid correspondent.
The new GTMs (26, 36, 60) support ecc, the GTM25 and 35 , no. The new operating system works with ecc, the "old" no. Finally, maybe some radio broadcasters in some countries do not transmit the code ecc, for compatibility with operating systems and GTMs oldest, but the most recent transmission, as my country, transmit (a).

Conclusion: Traffic will run pirate signature (of Jetmouse) when there is no concordance of at least one among the three elements cited, for example, in my country, the 3490 (new OS) works with the GTM 25 and 35, because these does not support ecc, but not with the new GTM 26, 36, 60 that supporting ecc (here FM radio TMC transmit the 4 parameters). These same GTM 26 or 36 work perfectly with a 1300 or 1400, because these gps use an operating system that does not require ecc for Traffic work, which also explains why these new GTMs also work with the 3700s. This is not by chance, but by mere matter of maintaining compatibility with existing devices and systems in countries that already use Traffic Garmin for long time. Currently all new models of Garmin GPS comes with new GTM 26, 36 or 60, that only work with official signature in new firmwares 2012, which is a way of curbing the expansion of Traffic pirates signatures, perhaps with the exception of countries where TMC signal transmits only 3 parameters, without ecc, but that friends can confirm.
To function properly the operating system of gps should take the ecc of broadcast radio and seek, together with the other 3 parameters, correspondence in signature GTM, in the trafficproviders.xml and so there is a tuning (fixation of the grid, pid, ltn. ..). If there is no correspondence, ie, the tuner has no ecc or different parameters of signature and trafficproviders, no tunning. But the key to it all, now, is the ecc, it matters to us.
Or let us be patient and hope until the developer of JetMouse to release a new version that includes ecc, or we find some way to disable the call of the ecc in firmware do gps or GTMs. Another possibility would be to try to write firmware of the gtm 25 to 26 or 35 to 36. I hope that arise solutions simpler, but will not be apparently very easy task..


Note: the only situation in which GTM26/36 works with the new operating system is in the moment that the signature is installed, but simply disconnect the GTM cable or GPS and no longer function in any way, although the Traffic symbol appear on the map, will not tune or obtain information from traffic

(a) One way to know which parameters are broadcast by local radio is analyzing the left column of the GTM Info (GTM FM Table) with 2012 firmware. In the case of my country are 4 parameters shown in hex (see figure). It is probable that in countries where radio TMC transmit less than 4 parameters, the new GTM with new operating systems do not work with Traffic (can not tune), which may have to do with the "bug" in the official signatures of Garmin, if it exists.


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