On Hainan, with maps everything is not as obvious as it seemed would at first glance. For example, Google Maps does not work there, only via VPN, you will not immediately find Chinese applications on the phone, and without knowledge of Chinese will be hard. Moreover, some cards are displayed in place with an offset (GPS shows correct coordinates, and on the map you are in another place), which is very confusing if you do not know about it in advance. I had a program on my phone Osmand with the uploaded map of China, it is not very detailed, but you can use.
Map of Hainan Island (clickable)
Map of buses in Sanya (clickable)
Briefly describe the situation with the cards. In fact, that’s what happened with me. We walked along Sanya with Osmand, showed the location correctly. But Moreover, if I enter the GPS coordinates in Osmand, taken for the desired I point in the usual Google map, the point is wrong in fact. BUT Now, if I find the right place on the Gogle satellite map and take already for this GPS point coordinates, then everything is fine, Osmand will show where it should be. That is, I conclude that a regular card from Google is shifted, you can use it not in GPS mode and you can not take it from her coordinates.
Ideally, if you go to China, then you need to put in advance application on the phone and order the necessary cards, working offline, so as not to get involved with local Chinese applications and trimmed by the internet.
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