Contrary to official information from Garmin that only GTM26 and above would be compatible with Traffic in Brazil, we can find the correct parameters (post 227) and proved that other types of receptors, such as GTM25 and above, also work perfectly. Lower versions have not yet worked, but the next days we will have more certainty from numerous tests. The compatibility issues seem to be connected to the operating system of GTM20/21, who do not read correctly the parameters of the signature.
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