Kolaportið

What the code says

The Grid Point Code for Kolaportið is #RDX9R-TM0H2. It names a cell 2.56 m north to south and 1.49 m east to west, centred on 64°08'55.96"N, 21°56'19.00"W, and it turns back into that cell on any phone or computer by arithmetic alone: no network, no account, no lookup table.

What it is

Flea market in Reykjavík, Iceland

Code

#RDX9R-TM0H2

With a check character

#RDX9R-TM0H2*G

Short form

TM0H2

Cell centre

64.148878, -21.938611

Cell size

2.56 m by 1.49 m

City

Reykjavík

Region

Capital Region

Country

Iceland

How to give this address

On a sign, a form or a delivery note

The whole code, #RDX9R-TM0H2. It needs nothing else: no city, no street, no network to read it back.

Said aloud, in Reykjavík

Kolaportið TM0H2: 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 Kolaportið. 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-TM0H2*G. 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. TRDX9RTSuburb1.6 km by 932 m
4. MRDX9RTMA few streets320 m by 186 m
5. 0RDX9RTM0Building64 m by 37.3 m
6. HRDX9RTM0HEntrance12.8 m by 7.46 m
7. 2RDX9RTM0H2Doorway2.56 m by 1.49 m

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