N'Djamena

What the code says

The Grid Point Code for N'Djamena is #JM68K-3799W. It names a cell 2.56 m north to south and 3.34 m east to west, centred on 12°06'24.21"N, 15°02'39.83"E, and it turns back into that cell on any phone or computer by arithmetic alone: no network, no account, no lookup table.

The point used is the one GeoNames records for N'Djamena, near its centre, and N'Djamena is the capital of Chad.

Code

#JM68K-3799W

With a check character

#JM68K-3799W*C

Short form

3799W

Cell centre

12.106725, 15.044398

Cell size

2.56 m by 3.34 m

Region

N'Djaména

Country

Chad

Population

1,359,526

How to give this address

On a sign, a form or a delivery note

The whole code, #JM68K-3799W. It needs nothing else: no city, no street, no network to read it back.

Said aloud, in N'Djaména

N'Djamena 3799W: 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 N'Djamena. 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

#JM68K-3799W*C. 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 52.2 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. 8JM68Metropolitan area40 km by 52.2 km
2. KJM68KDistrict8 km by 10.4 km
3. 3JM68K3Suburb1.6 km by 2.09 km
4. 7JM68K37A few streets320 m by 418 m
5. 9JM68K379Building64 m by 83.6 m
6. 9JM68K3799Entrance12.8 m by 16.7 m
7. WJM68K3799WDoorway2.56 m by 3.34 m

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