After leaving the castle, Li Yu first took out the map to check the direction he needed to go next.
The map was hand-drawn by himself because the chief steward did not allow Li Yu to copy it, so he took a photo with his mobile phone and later drew it out little by little in his notebook.
Except for not having the statue of the Silver Moon Goddess and being uncolored, it was basically no different from the original version.
However, Fosto mentioned that this map was also several hundred years old, and some places were probably not that accurate anymore, but Li Yu had no better options at hand and had to make do with it.
Maybe when he had time, he could use a drone to create a more accurate map on his own; he had chosen to bring a solar-powered charger during his last two visits.