Which GPS you found being the best to be used in China? Garmin, TomTom or the Chinese OEM brands. Any with Pinyin or english map? You found the info given by it accurate?
I am using a 650.00 RMB bought in HuaQianBei, not bad at all. I saved probably twice this money as it avoided me speed tickets telling with accuracy the fixed camera on the roads. But now, the police in Guandong is getting equipped with mobile radar...
Hainan where I live has funny policy. On national road, from Sanya to Haikou, you've got speed limited to... 5 Km/h! Even Roberto doing his jogging could be having a ticket! Lucky he doesn't put his plate license on his butt.