Mutianyu

What the code says

The Grid Point Code for Mutianyu is #KXGFJ-N0R3F. It names a cell 2.56 m north to south and 2.60 m east to west, centred on 40°26'16.88"N, 116°33'42.82"E, and it turns back into that cell on any phone or computer by arithmetic alone: no network, no account, no lookup table.

What it is

Section of the Great Wall of China

Code

#KXGFJ-N0R3F

With a check character

#KXGFJ-N0R3F*J

Short form

N0R3F

Cell centre

40.438022, 116.561894

Cell size

2.56 m by 2.60 m

Region

Beijing

Country

China

How to give this address

On a sign, a form or a delivery note

The whole code, #KXGFJ-N0R3F. It needs nothing else: no city, no street, no network to read it back.

Said aloud, in Beijing

Mutianyu N0R3F: a name both people know, then the last five characters. They give back the exact code for anywhere within 4.0 km north or south and 4.1 km east or west of Mutianyu. Further away the same five name somewhere else, which is why the whole code is what goes on a sign.

Copied by hand, or read over a phone

#KXGFJ-N0R3F*J. The character on the end catches any single mistyped symbol and any two neighbours swapped.

As a link or a square code

Open it on the map, move to the exact door, and add directions if the code needs help: "blue gate, second floor". The link and the square code carry them. Nothing is kept on this site.

From the city to the door

The first four characters name a cell about 40 km by 40.7 km here. Each one after that picks one of 25 inside the last, so the whole ten name a spot about the size of a doorway.

1. FKXGFMetropolitan area40 km by 40.7 km
2. JKXGFJDistrict8 km by 8.13 km
3. NKXGFJNSuburb1.6 km by 1.63 km
4. 0KXGFJN0A few streets320 m by 325 m
5. RKXGFJN0RBuilding64 m by 65.1 m
6. 3KXGFJN0R3Entrance12.8 m by 13 m
7. FKXGFJN0R3FDoorway2.56 m by 2.6 m

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