Nor Sor 3 Gor sits one step below the chanote. The plot has been measured against aerial photographs and has a defined position, so sales, leases and mortgages can be registered at the land office without the 30-day public notice that a plain Nor Sor 3 requires. In strict legal terms the document certifies possession and use, not full ownership, although in day-to-day dealings it is treated as close to equivalent.
The weakness is precision. Boundaries are less exact than on a chanote, and fences on the ground do not always follow the map. Before agreeing a lease, ask the land office for a boundary survey and ask the owner to apply for the upgrade to chanote, ideally as a condition of the contract. The upgrade is routine where nobody objects, but it takes time, and the surveyed area can come out smaller than the area on paper.
See title deeds and due diligence and buying a villa in Thailand.
