Lisbon

What the code says

The Grid Point Code for Lisbon is #HX8HC-WLK05. It names a cell 2.56 m north to south and 2.67 m east to west, centred on 38°43'30.33"N, 9°08'59.33"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 Lisbon, near its centre, and Lisbon is the capital of Portugal.

Code

#HX8HC-WLK05

With a check character

#HX8HC-WLK05*P

Short form

WLK05

Cell centre

38.725091, -9.149814

Cell size

2.56 m by 2.67 m

Country

Portugal

Population

517,802

How to give this address

On a sign, a form or a delivery note

The whole code, #HX8HC-WLK05. It needs nothing else: no city, no street, no network to read it back.

Said aloud, in Portugal

Lisbon WLK05: 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 4.2 km east or west of Lisbon. 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

#HX8HC-WLK05*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 41.7 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. HHX8HMetropolitan area40 km by 41.7 km
2. CHX8HCDistrict8 km by 8.34 km
3. WHX8HCWSuburb1.6 km by 1.67 km
4. LHX8HCWLA few streets320 m by 333 m
5. KHX8HCWLKBuilding64 m by 66.7 m
6. 0HX8HCWLK0Entrance12.8 m by 13.3 m
7. 5HX8HCWLK05Doorway2.56 m by 2.67 m

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