Mount Vesuvius

What the code says

The Grid Point Code for Mount Vesuvius is #J1D9J-R2GCP. It names a cell 2.56 m north to south and 2.59 m east to west, centred on 40°49'21.38"N, 14°25'45.12"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 in the Gulf of Naples, Italy

Code

#J1D9J-R2GCP

With a check character

#J1D9J-R2GCP*9

Short form

R2GCP

Cell centre

40.822606, 14.429199

Cell size

2.56 m by 2.59 m

Region

Campania

Country

Italy

How to give this address

On a sign, a form or a delivery note

The whole code, #J1D9J-R2GCP. It needs nothing else: no city, no street, no network to read it back.

Said aloud, in Campania

Mount Vesuvius R2GCP: 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 Mount Vesuvius. 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

#J1D9J-R2GCP*9. 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 40.4 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. 9J1D9Metropolitan area40 km by 40.4 km
2. JJ1D9JDistrict8 km by 8.09 km
3. RJ1D9JRSuburb1.6 km by 1.62 km
4. 2J1D9JR2A few streets320 m by 323 m
5. GJ1D9JR2GBuilding64 m by 64.7 m
6. CJ1D9JR2GCEntrance12.8 m by 12.9 m
7. PJ1D9JR2GCPDoorway2.56 m by 2.59 m

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