The 'Yu Ji Tu', or 'Map of the Tracks of Yu Gong', carved into stone in 1137 and located in the Stele Forest of Xian
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What the HECK!!?! Wow. It has a GRATICULE?!!?!?!? This is astonishing. I know of no graticules anywhere near so early, by centuries!!
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As far as I know, the geometric grid reference for maps was introduced in China by Zhang Heng (AD 78–139), that is before Ptolemy published his 'Geography' (around AD 150). See H. Nelson (1974) 'Chinese Maps: An Exhibition at the British Library'. The China Quarterly. 58: 357–362