Cant really speak for the Omega on this one, but generally the following would apply.
TMC is broadcast in the UK via the Classic FM network, but unlike the rest of Europe where it is free, surprise surprise, in the UK we have to pay for it on a subscription basis.
This is generally done via the purchase of a Navigation software disc with the subscription fees included. ten years ago, when you bought an updated software disc, there were often two versions available, one with TMC and one without, and you paid accordingly. Most Navigation systems nowadays automatically have TMC included in the software as they found that automatically including it at the time of purchase was the only way that anybody ever received any revenue for it.
Again, going back ten years, Some of the Philips and Carin systems (unsure about Omega?) certainly had the TMC logo shown on the screens, but it would not work unless you purchased an external TMC receiver and aerial that came with its own software - this continued on most of the Early VDO / VDO-Dayton systems also - although like many other dealers around the country, we were left with them in our stockrooms gathering dust for the same reasons - in the early days of TMC nobody wanted to pay extra for it.
Although commonplace now, unsure if TMC software (or any hardware if required) would be retrospectively available for what now could be considered a very old and near obsolete system?
:-/