Georgetown

What the code says

The Grid Point Code for Georgetown is #H0NM4-DC89J. It names a cell 2.56 m north to south and 3.40 m east to west, centred on 6°48'16.14"N, 58°09'19.00"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 Georgetown, near its centre, and Georgetown is the capital of Guyana.

Code

#H0NM4-DC89J

With a check character

#H0NM4-DC89J*9

Short form

DC89J

Cell centre

6.804484, -58.155279

Cell size

2.56 m by 3.40 m

Region

Demerara-Mahaica

Country

Guyana

Population

235,017

How to give this address

On a sign, a form or a delivery note

The whole code, #H0NM4-DC89J. It needs nothing else: no city, no street, no network to read it back.

Said aloud, in Demerara-Mahaica

Georgetown DC89J: 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 Georgetown. 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

#H0NM4-DC89J*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 53.1 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. MH0NMMetropolitan area40 km by 53.1 km
2. 4H0NM4District8 km by 10.6 km
3. DH0NM4DSuburb1.6 km by 2.12 km
4. CH0NM4DCA few streets320 m by 424 m
5. 8H0NM4DC8Building64 m by 84.9 m
6. 9H0NM4DC89Entrance12.8 m by 17 m
7. JH0NM4DC89JDoorway2.56 m by 3.4 m

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