Porto-Novo

What the code says

The Grid Point Code for Porto-Novo is #JP8J2-915C2. It names a cell 2.56 m north to south and 3.40 m east to west, centred on 6°29'47.26"N, 2°36'12.95"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 Porto-Novo, near its centre, and Porto-Novo is the capital of Benin.

Code

#JP8J2-915C2

With a check character

#JP8J2-915C2*T

Short form

915C2

Cell centre

6.496462, 2.603597

Cell size

2.56 m by 3.40 m

Region

Ouémé

Country

Benin

Population

264,320

How to give this address

On a sign, a form or a delivery note

The whole code, #JP8J2-915C2. It needs nothing else: no city, no street, no network to read it back.

Said aloud, in Ouémé

Porto-Novo 915C2: 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 5.3 km east or west of Porto-Novo. 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

#JP8J2-915C2*T. 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 53.1 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. JJP8JMetropolitan area40 km by 53.1 km
2. 2JP8J2District8 km by 10.6 km
3. 9JP8J29Suburb1.6 km by 2.12 km
4. 1JP8J291A few streets320 m by 425 m
5. 5JP8J2915Building64 m by 84.9 m
6. CJP8J2915CEntrance12.8 m by 17 m
7. 2JP8J2915C2Doorway2.56 m by 3.4 m

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