Perperikon

What the code says

The Grid Point Code for Perperikon is #J29RX-8375T. It names a cell 2.56 m north to south and 2.55 m east to west, centred on 41°42'52.97"N, 25°27'54.96"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

Archaeological site in Bulgaria

Code

#J29RX-8375T

With a check character

#J29RX-8375T*G

Short form

8375T

Cell centre

41.714715, 25.465267

Cell size

2.56 m by 2.55 m

Region

Kardzhali

Country

Bulgaria

How to give this address

On a sign, a form or a delivery note

The whole code, #J29RX-8375T. It needs nothing else: no city, no street, no network to read it back.

Said aloud, in Kardzhali

Perperikon 8375T: 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 4.0 km east or west of Perperikon. 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

#J29RX-8375T*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 39.9 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. RJ29RMetropolitan area40 km by 39.9 km
2. XJ29RXDistrict8 km by 7.98 km
3. 8J29RX8Suburb1.6 km by 1.6 km
4. 3J29RX83A few streets320 m by 319 m
5. 7J29RX837Building64 m by 63.8 m
6. 5J29RX8375Entrance12.8 m by 12.8 m
7. TJ29RX8375TDoorway2.56 m by 2.55 m

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