Quote Originally Posted by Quarktasche10 View Post
Can you confirm that on governemental request routing is allowed to use correction algorithms (under NDA), but mapping must be left offsetted?
Not sure what do you mean by correction algorithm? The official map itself is never corrected. Instead, the coordinates received from the GPS chipset are added by the same amount of shift (i.e. the same x'=f(x, y) and y'=g(x, y) transformation) to match the shifted map. As a result it appears no shift to the user, but the recorded track will have shifted coordinates (well, newer devices provide both coordinates before and after the addition now). The code to do the transformation is written and compiled by the government then licensed to the GPS device maker.

Quote Originally Posted by Quarktasche10 View Post
4: I did. The answer was a little bit like 1-3. He told me that in China things can be of legal issue without being explicit forbidden. So there would be a risk in doing anything not being explicit allowed. Is this interpretation right?
I am not a lawyer, but that's the common interpretation.