Petra

What the code says

The Grid Point Code for Petra is #J7N35-90WJ5. It names a cell 2.56 m north to south and 2.95 m east to west, centred on 30°19'44.04"N, 35°26'24.96"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

Ancient rock-cut historical city in Jordan

Code

#J7N35-90WJ5

With a check character

#J7N35-90WJ5*R

Short form

90WJ5

Cell centre

30.328900, 35.440266

Cell size

2.56 m by 2.95 m

Region

Ma'an Governorate

Country

Jordan

How to give this address

On a sign, a form or a delivery note

The whole code, #J7N35-90WJ5. It needs nothing else: no city, no street, no network to read it back.

Said aloud, in Ma'an Governorate

Petra 90WJ5: 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 4.6 km east or west of Petra. 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

#J7N35-90WJ5*R. 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 46.1 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. 3J7N3Metropolitan area40 km by 46.1 km
2. 5J7N35District8 km by 9.22 km
3. 9J7N359Suburb1.6 km by 1.84 km
4. 0J7N3590A few streets320 m by 369 m
5. WJ7N3590WBuilding64 m by 73.8 m
6. JJ7N3590WJEntrance12.8 m by 14.8 m
7. 5J7N3590WJ5Doorway2.56 m by 2.95 m

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