Gwangjang Market

What the code says

The Grid Point Code for Gwangjang Market is #L0T4L-X238F. It names a cell 2.56 m north to south and 2.71 m east to west, centred on 37°34'12.01"N, 126°59'56.45"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

Market in Jongno-gu, Seoul, South Korea

Code

#L0T4L-X238F

With a check character

#L0T4L-X238F*9

Short form

X238F

Cell centre

37.570003, 126.999014

Cell size

2.56 m by 2.71 m

City

Seoul

Region

Seoul

Country

South Korea

How to give this address

On a sign, a form or a delivery note

The whole code, #L0T4L-X238F. It needs nothing else: no city, no street, no network to read it back.

Said aloud, in Seoul

Gwangjang Market X238F: 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 4.2 km east or west of Gwangjang Market. 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

#L0T4L-X238F*9. 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 42.4 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. 4L0T4Metropolitan area40 km by 42.4 km
2. LL0T4LDistrict8 km by 8.47 km
3. XL0T4LXSuburb1.6 km by 1.69 km
4. 2L0T4LX2A few streets320 m by 339 m
5. 3L0T4LX23Building64 m by 67.8 m
6. 8L0T4LX238Entrance12.8 m by 13.6 m
7. FL0T4LX238FDoorway2.56 m by 2.71 m

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