To support you, the USSR had mapped nearly the entire world (presumably with aid of satellites and GPS):<p>&quot;The Soviets made far more detailed maps of some parts of the world. They mapped all of Europe, nearly all of Asia, as well as large parts of North America and northern Africa at 1:100,000 and 1:50,000 scales, which show even more features and fine-grained topography.&quot;<p>I sincerely doubt they have any of the China GPS offsets.<p><a href="http:&#x2F;&#x2F;www.wired.com&#x2F;2015&#x2F;07&#x2F;secret-cold-war-maps&#x2F;" rel="nofollow">http:&#x2F;&#x2F;www.wired.com&#x2F;2015&#x2F;07&#x2F;secret-cold-war-maps&#x2F;</a>