https://web.archive.org/web/20240505060605/https://medium.com/@anastasia.bizyayeva/every-map-of-china-is-wrong-bc2bce145db2

GCJ-02 is a WGS-84 based geodetic reference system for China. It has an algorithm applied introducing discrepancies, ensuring only a handful of Chinese companies and the government have accurate map information. Article mentions that some countries have their own geodesic data, I think that might be wrong, most will have their own as it is a historically strategic thing. EU has its own, as does NL at country level. ITRS and its derivation WGS-84 are global ones. Is GCJ-02 a global model or also a national?