If you see Navicom and don't HERE as your Traffic Provider, you probably need to update your Traffic Provider list (database). It's an xml file available via Garmin Express or WebUpdater. I updated my Nuvi 3490 a couple of months ago and now I see both Navicom and HERE as my Traffic Providers.
As to me, I have an updated TrafficProvider.xml file and only Navicom is detected and listed by my nuvi as a provider.
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