I used Tangtu in the US last year. It worked well within the state, but it didn't work at the boundary of two states. In Death Valley and Page, it didn't work. I reported it to their customer service, and they said there was a problem with it. Is there a problem with the paid version ?

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Navigon I use from Europe to the United States, every year I take Road trip groups of ten or eight, and there has never been any problem. The positioning is extremely accurate, and the road conditions are on par with Google. The navigation is clearer. But the price is a bit expensive, plus the camera and road conditions are full of configurations for more than 500 RMB. Sygic is cheaper and also good, all down to more than 300 Both of these can be used without any signal at all, which is extremely convenient to use.