Olumo Rock

What the code says

The Grid Point Code for Olumo Rock is #JP8W0-HNL16. It names a cell 2.56 m north to south and 3.39 m east to west, centred on 7°10'02.10"N, 3°20'33.35"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

Tourist attraction in Abeokuta, Ogun State Nigeria

Code

#JP8W0-HNL16

With a check character

#JP8W0-HNL16*G

Short form

HNL16

Cell centre

7.167249, 3.342597

Cell size

2.56 m by 3.39 m

Region

Ogun State

Country

Nigeria

How to give this address

On a sign, a form or a delivery note

The whole code, #JP8W0-HNL16. It needs nothing else: no city, no street, no network to read it back.

Said aloud, in Ogun State

Olumo Rock HNL16: 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 Olumo Rock. 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

#JP8W0-HNL16*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 53 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. WJP8WMetropolitan area40 km by 53 km
2. 0JP8W0District8 km by 10.6 km
3. HJP8W0HSuburb1.6 km by 2.12 km
4. NJP8W0HNA few streets320 m by 424 m
5. LJP8W0HNLBuilding64 m by 84.8 m
6. 1JP8W0HNL1Entrance12.8 m by 17 m
7. 6JP8W0HNL16Doorway2.56 m by 3.39 m

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