Hello and welcome,
You don't have to upgrade unless you feel that the maps in your area need improvement. I have both maps installed on my 910 and I use the older version for different reasons. One reason because it shows the speed limits on a few highways.
I dont understand if you just purchased a TT why should you have to buy an upgrade of the maps? Just another way for them to make money and screw us TYPICAL! Plus the maps arnt up to date as i have found but they wont give your money back. Its a shame they take advantage of us like that, has put me off on getting another TT
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