etrex does not have China maps. Part of the trouble is that maps are a state secret. As such, GPS units that are offered outside of the Chinese market will not do what I want. Also, the batteries purchased in China are of very poor quality. You cannot plan on a battery in China lasting more than half as long as a similar battery purchased on the US.
I have a small GPS with good battery life; however, it does not display maps. I actually doubt that I need the maps display; but, The last time I made a similar trip I ran into trouble when the road detoured at one point.