Mount Etna

What the code says

The Grid Point Code for Mount Etna is #J111R-9CTL9. It names a cell 2.56 m north to south and 2.70 m east to west, centred on 37°45'03.04"N, 14°59'35.59"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

Active stratovolcano on the east coast of Sicily, Italy

Code

#J111R-9CTL9

With a check character

#J111R-9CTL9*7

Short form

9CTL9

Cell centre

37.750844, 14.993219

Cell size

2.56 m by 2.70 m

Region

Sicily

Country

Italy

How to give this address

On a sign, a form or a delivery note

The whole code, #J111R-9CTL9. It needs nothing else: no city, no street, no network to read it back.

Said aloud, in Sicily

Mount Etna 9CTL9: 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 4.2 km east or west of Mount Etna. 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

#J111R-9CTL9*7. 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 42.2 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. 1J111Metropolitan area40 km by 42.2 km
2. RJ111RDistrict8 km by 8.45 km
3. 9J111R9Suburb1.6 km by 1.69 km
4. CJ111R9CA few streets320 m by 338 m
5. TJ111R9CTBuilding64 m by 67.6 m
6. LJ111R9CTLEntrance12.8 m by 13.5 m
7. 9J111R9CTL9Doorway2.56 m by 2.7 m

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