I did some more sleuthing into hacking TMC into the RNS510 by looking at the TMC enabled euro maps. Sadly even though the key is easy to decrypt with linux and a card with fm radio, it isn't just a matter of entering it into the maps disc in a config file. The VW maps have a whole look up database to assign the data sent over TMC to the actual roads on the maps.
Very much in VWs hands to make SUNA work
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