I will check it so I do not have this problem!!! I get unlock for TMC with unique ID of TMC reciever from Garmin.com and after this TMC receiver work with all Nuvi. As I write above we have only own cradle and power cord with build-in TMC in car but Nuvi may be any that comes handy. It is work fine.
May be you unlock your TMC receiver with ID from Nuvi?
P.S. I check it after returning to home. I have a dozen of old TMC receiver. You know after return Garmin with warranty you may except the device keep the whole rest yourself.
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