TMC can be a generic* term, "radio' TMC is RDS. Online TMC (a common** term) is used to indicate traffic without RDS. Same data could be used to generate RDS and online TMC. TomTom is "good" in certain areas because they provide services for PNA devices as well. TomTom "live" is just a marketing hype. It's possible to built a "gateway" that received RDS-TMC, extract data and distributed it via online. Something that NNG can easily do; but it's not legal unless they have permission from vendor such as TomTom (or Garmin)
* When used in the context of PNA devices (which most are RDS), then it referred to RDS-TMC. When used in context of devices without RDS, then it referred to online-TMC
** For android devices, I do not know of any that does RDS-TMC, so the use of Online TMC is appropriate; if this is wrong, please indicates which android device that can do RDS-TMC



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