London

EnglandUnited Kingdom

With a code: #R0NJ1-623G6
Said aloud: London 623G6

What the code says

The Grid Point Code for London is #R0NJ1-623G6. It names a cell 2.56 m north to south and 2.13 m east to west, centred on 51°30'30.73"N, 0°07'32.71"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 London, near its centre, and London is the capital of United Kingdom.

Code: #R0NJ1-623G6
With a check character: #R0NJ1-623G6*9
Short form: 623G6
Cell centre: 51.508535, -0.125752
Cell size: 2.56 m by 2.13 m
Region: England
Country: United Kingdom
Population: 8,961,989

How to give this address

On a sign, a form or a delivery note: The whole code, #R0NJ1-623G6. It needs nothing else: no city, no street, no network to read it back.
Said aloud, in England: London 623G6: 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 3.3 km east or west of London. 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: #R0NJ1-623G6*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 33.3 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.

R0NJMetropolitan area40 km by 33.3 km
R0NJ1District8 km by 6.65 km
R0NJ16Suburb1.6 km by 1.33 km
R0NJ162A few streets320 m by 266 m
R0NJ1623Building64 m by 53.2 m
R0NJ1623GEntrance12.8 m by 10.6 m
R0NJ1623G6Doorway2.56 m by 2.13 m

More in United Kingdom

City, region and population from GeoNames, under CC BY 4.0.