Citadelle Laferrière

What the code says

The Grid Point Code for Citadelle Laferrière is #GG4X7-T8L20. It names a cell 2.56 m north to south and 3.22 m east to west, centred on 19°34'25.03"N, 72°14'38.04"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

Large mountaintop fortress in northern Haiti

Code

#GG4X7-T8L20

With a check character

#GG4X7-T8L20*G

Short form

T8L20

Cell centre

19.573620, -72.243901

Cell size

2.56 m by 3.22 m

Region

Nord

Country

Haiti

How to give this address

On a sign, a form or a delivery note

The whole code, #GG4X7-T8L20. It needs nothing else: no city, no street, no network to read it back.

Said aloud, in Nord

Citadelle Laferrière T8L20: 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 5.0 km east or west of Citadelle Laferrière. 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

#GG4X7-T8L20*G. 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 50.3 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. XGG4XMetropolitan area40 km by 50.3 km
2. 7GG4X7District8 km by 10.1 km
3. TGG4X7TSuburb1.6 km by 2.01 km
4. 8GG4X7T8A few streets320 m by 403 m
5. LGG4X7T8LBuilding64 m by 80.6 m
6. 2GG4X7T8L2Entrance12.8 m by 16.1 m
7. 0GG4X7T8L20Doorway2.56 m by 3.22 m

More in Haiti

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