Actually I found out it does work. In the settings of Sygic you’ll find Bosch MySpin and it shows disabled. Choose it and Enable it. Sygic will then work in the dash.
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Since I'm returning my new zumo XT, I thought I'd try Sygic again, just to see if I could make it work. I don't have Bosch MySpin on my Samsung Galaxy S10+ (Android). Any suggestions?