Cayenne

What the code says

The Grid Point Code for Cayenne is #H0G99-HR84G. It names a cell 2.56 m north to south and 3.41 m east to west, centred on 4°56'17.18"N, 52°20'04.37"W, and it turns back into that cell on any phone or computer by arithmetic alone: no network, no account, no lookup table.

The point used is the one GeoNames records for Cayenne, near its centre, and Cayenne is the capital of French Guiana.

Code

#H0G99-HR84G

With a check character

#H0G99-HR84G*9

Short form

HR84G

Cell centre

4.938106, -52.334546

Cell size

2.56 m by 3.41 m

Region

Guyane

Country

French Guiana

Population

61,550

How to give this address

On a sign, a form or a delivery note

The whole code, #H0G99-HR84G. It needs nothing else: no city, no street, no network to read it back.

Said aloud, in Guyane

Cayenne HR84G: 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 5.3 km east or west of Cayenne. 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

#H0G99-HR84G*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 53.2 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. 9H0G9Metropolitan area40 km by 53.2 km
2. 9H0G99District8 km by 10.6 km
3. HH0G99HSuburb1.6 km by 2.13 km
4. RH0G99HRA few streets320 m by 426 m
5. 8H0G99HR8Building64 m by 85.2 m
6. 4H0G99HR84Entrance12.8 m by 17 m
7. GH0G99HR84GDoorway2.56 m by 3.41 m