Thread: Using TMC in Garmin nuvi for free

There are differences between the GTM25 and 26, but that does not make hardly any difference in signal reception and use of the Traffic in most countries. From my observations, the GTM26 has greater skill in handling signatures with ecc (extended country code). For example, the Japanese firmware of the Nuvis 13xx/14xx support the GTM25, but are not compatible with the GTM26, perhaps because it does not handle properly the ecc. Another detail that denotes technical differences appear in the Diagnostic / GTM Status: GTM26 have the connection type 4G and GTM25 type 3G, which can be confirmed too in the Inventory of the GPS, but they are technical details that may be better explained by electronic specialists ..

**The Nuvi 1490T, LT and LMT are also packed with GTM26. Everything indicates that this should probably replace the GTM25.