I am using Taiwan CN2014.20 incl. Address search Taiwan 2014.20.
I guess this is also the reason why I have TMC because transmitted by 3G and it's free.
Btw.
Not sure whether useful or any meaning, but in data/data/com.garmin.android.apps.gmobilext/persist//Garmin is a file called ".esn".
This contains a 10-digit number which looks like a Unit ID.

Cheers
Tom