It is not possible to activate TMC if there is no signal of FM RDS radio available.
In relation to the Jetmouse signature, she is always activate, but for the system to operate is required TMC FM RDS signal.
The coverage area is generally of the same standard covered by frequency of the conventional FM radio broadcasts. Attention because the tuners GTM 36 and 26 do not work with subscription jetmouse in the firmwares of 34xx, 35xx, inside or outside the coverage area..