Ciudad Perdida

What the code says

The Grid Point Code for Ciudad Perdida is #GK90J-5D810. It names a cell 2.56 m north to south and 3.36 m east to west, centred on 11°02'16.77"N, 73°55'30.75"W, 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

Lost city

Code

#GK90J-5D810

With a check character

#GK90J-5D810*M

Short form

5D810

Cell centre

11.037992, -73.925207

Cell size

2.56 m by 3.36 m

Region

Magdalena Department

Country

Colombia

How to give this address

On a sign, a form or a delivery note

The whole code, #GK90J-5D810. It needs nothing else: no city, no street, no network to read it back.

Said aloud, in Magdalena Department

Ciudad Perdida 5D810: 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 5.2 km east or west of Ciudad Perdida. 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

#GK90J-5D810*M. 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 52.4 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. 0GK90Metropolitan area40 km by 52.4 km
2. JGK90JDistrict8 km by 10.5 km
3. 5GK90J5Suburb1.6 km by 2.1 km
4. DGK90J5DA few streets320 m by 420 m
5. 8GK90J5D8Building64 m by 83.9 m
6. 1GK90J5D81Entrance12.8 m by 16.8 m
7. 0GK90J5D810Doorway2.56 m by 3.36 m

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