This part of the article explains more:<p><a href="https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Restrictions_on_geographic_data_in_China#GCJ-02" rel="nofollow">https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Restrictions_on_geographic_dat...</a><p>&quot;GCJ-02 (aka Mars Coordinates) is a geodetic datum formulated by the Chinese State Bureau of Surveying and Mapping, and based on WGS-84.[12] It uses an encryption algorithm[13] which adds apparently random offsets to both the latitude and longitude, with the alleged goal of improving national security.[14][15]&quot;<p>&quot;Despite the secrecy surrounding the GCJ-02 encryption, several open-source projects exist that provide conversions between GCJ-02 and WGS-84, for languages including C#,[20] C, Go, Java, JavaScript, PHP,[21] Python,[22] R,[14] and Ruby.[23][24] They appear to be based on leaked code.[25]&quot;