Campo de' Fiori

What the code says

The Grid Point Code for Campo de' Fiori is #J1N55-XF4G8. It names a cell 2.56 m north to south and 2.55 m east to west, centred on 41°53'44.42"N, 12°28'19.41"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

Square in Rome, Italy

Code

#J1N55-XF4G8

With a check character

#J1N55-XF4G8*R

Short form

XF4G8

Cell centre

41.895671, 12.472059

Cell size

2.56 m by 2.55 m

City

Rome

Region

Lazio

Country

Italy

How to give this address

On a sign, a form or a delivery note

The whole code, #J1N55-XF4G8. It needs nothing else: no city, no street, no network to read it back.

Said aloud, in Rome

Campo de' Fiori XF4G8: 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 Campo de' Fiori. 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

#J1N55-XF4G8*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 39.8 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. 5J1N5Metropolitan area40 km by 39.8 km
2. 5J1N55District8 km by 7.95 km
3. XJ1N55XSuburb1.6 km by 1.59 km
4. FJ1N55XFA few streets320 m by 318 m
5. 4J1N55XF4Building64 m by 63.6 m
6. GJ1N55XF4GEntrance12.8 m by 12.7 m
7. 8J1N55XF4G8Doorway2.56 m by 2.55 m

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