This thread is a sticky.
The very first post in this thread by Catymag is very useful. Yes, you need the GTM 20's ID number.
From the first post:
"Each TMC receiver has its own 10-digit ID.
This one is another number then nuvi ID, you can find it only when nuvi is connected to TMC receivers. Go to menu Tools, Settings, Traffic, Subscriptions, Add and see message containg your TMC receiver ID.
Each subscription has its FID, PID, RgnID an VenID, similarly to Garmin map product. All known subscription ID are gathered at the end of this post.
Both values, TMC ID and subscription ID can be used to generate unlock code. Use [Only registered and activated users can see links. ] for creating unlock codes.
Start keygen, insert TMC ID into field Enter your Unit ID here then go to Select Map Product and choose Custom Mapset. In Custom Mapset window check Enable additional fields and fill all 4 values for FID, PID, RgnID, VenID.
You should manualy rewrite unlock code to TMC receiver in the same menu you used to find TMC receiver ID."
My original post should have included instructions to always read the first post in a sticky thread. Please note you'll need to Google for the two different versions of Jetmouse required. Good luck!
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