Grid Point Code
Source on GitHub

Play

Belfast

Northern IrelandUnited Kingdom

Grid Point Code for Belfast
With a code
#R927M-8G939
Said aloud
Belfast 8G939

Get the code for your door

What the code says

The Grid Point Code for Belfast is #R927M-8G939. It names a cell 2.56 m north to south and 1.98 m east to west, centred on 54°35'48.54"N, 5°55'31.48"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 Belfast, near its centre.

Code
#R927M-8G939
With a check character
#R927M-8G939*6
Short form
8G939
Cell centre
54.596817, -5.925412
Cell size
2.56 m by 1.98 m
Region
Northern Ireland
Country
United Kingdom
Population
348,005

How to give this address

On a sign, a form or a delivery note

The whole code, #R927M-8G939. It needs nothing else: no city, no street, no network to read it back.

Said aloud, in Northern Ireland

Belfast 8G939: 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 3.1 km east or west of Belfast. 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

#R927M-8G939*6. 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 31 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. R927Metropolitan area40 km by 31 km
  2. R927MDistrict8 km by 6.19 km
  3. R927M8Suburb1.6 km by 1.24 km
  4. R927M8GA few streets320 m by 248 m
  5. R927M8G9Building64 m by 49.5 m
  6. R927M8G93Entrance12.8 m by 9.91 m
  7. R927M8G939Doorway2.56 m by 1.98 m

More in United Kingdom

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