Reykjavík

What the code says

The Grid Point Code for Reykjavík is #RDX9R-JRJMD. It names a cell 2.56 m north to south and 1.49 m east to west, centred on 64°08'07.69"N, 21°53'43.51"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 Reykjavík, near its centre, and Reykjavík is the capital of Iceland.

Code

#RDX9R-JRJMD

With a check character

#RDX9R-JRJMD*P

Short form

JRJMD

Cell centre

64.135469, -21.895419

Cell size

2.56 m by 1.49 m

Region

Capital Region

Country

Iceland

Population

118,918

How to give this address

On a sign, a form or a delivery note

The whole code, #RDX9R-JRJMD. It needs nothing else: no city, no street, no network to read it back.

Said aloud, in Capital Region

Reykjavík JRJMD: 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 2.3 km east or west of Reykjavík. 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

#RDX9R-JRJMD*P. 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 23.3 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.

1. 9RDX9Metropolitan area40 km by 23.3 km
2. RRDX9RDistrict8 km by 4.66 km
3. JRDX9RJSuburb1.6 km by 932 m
4. RRDX9RJRA few streets320 m by 186 m
5. JRDX9RJRJBuilding64 m by 37.3 m
6. MRDX9RJRJMEntrance12.8 m by 7.46 m
7. DRDX9RJRJMDDoorway2.56 m by 1.49 m

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