Sygic is a good sat nav app
I think tomtoms are not appealing anymore after mobiles and map apps have become really good.
Just use Waze on your phone?
Just tried using Google maps on gran canaria, absolutely useless, no proper directions, no corrections if you go wrong. Left Tom Tom at home for weight/packing reasons. Now using Here which is better. Tom Tom way better for me.
Then you need a truckers sat nav and not this. That's how lorries get stuck down country lanes.