Helsinki

What the code says

The Grid Point Code for Helsinki is #PL9G0-KD144. It names a cell 2.56 m north to south and 1.70 m east to west, centred on 60°10'10.29"N, 24°56'07.58"E, 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 Helsinki, near its centre, and Helsinki is the capital of Finland.

Code

#PL9G0-KD144

With a check character

#PL9G0-KD144*0

Short form

KD144

Cell centre

60.169524, 24.935439

Cell size

2.56 m by 1.70 m

Region

Uusimaa

Country

Finland

Population

658,864

How to give this address

On a sign, a form or a delivery note

The whole code, #PL9G0-KD144. It needs nothing else: no city, no street, no network to read it back.

Said aloud, in Uusimaa

Helsinki KD144: 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 2.7 km east or west of Helsinki. 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

#PL9G0-KD144*0. 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 26.6 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. GPL9GMetropolitan area40 km by 26.6 km
2. 0PL9G0District8 km by 5.32 km
3. KPL9G0KSuburb1.6 km by 1.06 km
4. DPL9G0KDA few streets320 m by 213 m
5. 1PL9G0KD1Building64 m by 42.5 m
6. 4PL9G0KD14Entrance12.8 m by 8.51 m
7. 4PL9G0KD144Doorway2.56 m by 1.7 m

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