Does anybody know if there is a limit of how many subscriptions you can add to a GTM20.
Are the remove subscriptions (0,0,0) counted towards that limit number if in fact there is one?

If that limit is reached, and you add a new code that is accepted, does it delete a previous one to make room?

The reason I ask is my GMT20 shows lifetime subscriptions for both Navteq & TTN. Yet when I go into the FM table it only shows "no name" with 7 existing FM frequency numbers, sometimes more than 7, sometimes less depending on signal strength. I know for a fact these are Navteq stations.

Although the subscription page shows Lifetime for both Navteq & TTN, & the GTMInfo\Fm Table page also displays the subscriptions for both Navteq & TTN,
I am not receiving any TTN whatsoever.
Doing an experiment with my friends 265W with the GTM 25, and my 765T with a GTM20, both units side be side, his GTM25 shows both Navteq
and TTN frequencies displayed in the table, mine only the Navteq.

I have tried countless times to remove the TTN subscriptions, then add new ones, each time message indicates the subscription was accepted, yet I don’t receive any TTN channels. The signal is there as my friends unit proves that fact.

Is it possible that my GTM will no longer accept any new codes even though it showed they were accepted.
What if I have 6 TTN codes that were accepted, how does the receiver know which one to use?