Yes google maps work ok with Tlink (i dislike that it is not wireless and needs usb cable). You need to add it in safe apps for Headunit, it works even while driving.
If you want to have full phone access (using other apps and play video) through Tlink you need to ground a wire in the Headunit (as in video below).
Since it requires USB cable, people can really get fed up with this.
I upgraded to REVO headunit as it has offline navigation, wifi and wireless connectivity (does not require USB cable)