Piton de la Fournaise

What the code says

The Grid Point Code for Piton de la Fournaise is #8C810-R74F3. It names a cell 2.56 m north to south and 3.19 m east to west, centred on 21°14'35.24"S, 55°42'26.04"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

Volcano on the French oversea department La Réunion

Code

#8C810-R74F3

With a check character

#8C810-R74F3*8

Short form

R74F3

Cell centre

-21.243122, 55.707233

Cell size

2.56 m by 3.19 m

Region

Reunion

Country

Réunion

How to give this address

On a sign, a form or a delivery note

The whole code, #8C810-R74F3. It needs nothing else: no city, no street, no network to read it back.

Said aloud, in Reunion

Piton de la Fournaise R74F3: 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 5.0 km east or west of Piton de la Fournaise. 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

#8C810-R74F3*8. 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 49.8 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. 18C81Metropolitan area40 km by 49.8 km
2. 08C810District8 km by 9.96 km
3. R8C810RSuburb1.6 km by 1.99 km
4. 78C810R7A few streets320 m by 398 m
5. 48C810R74Building64 m by 79.7 m
6. F8C810R74FEntrance12.8 m by 15.9 m
7. 38C810R74F3Doorway2.56 m by 3.19 m

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