Grid Point Code

Play

El Rastro

MadridSpain

Without a code
El Rastro, Madrid, and then directions
With a code
#HXGFM-8P2L6
Said aloud
El Rastro 8P2L6

This code is one spot in El Rastro, a cell 2.56 m by 2.60 m. Every stall front and doorway in it has a code of its own.

Get the code for your door

What the code says

The Grid Point Code for El Rastro is #HXGFM-8P2L6. It names a cell 2.56 m north to south and 2.60 m east to west, centred on 40°24'32.04"N, 3°42'26.96"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
Is the most popular open air flea market in Madrid (Spain). It is held every Sunday and public holiday during the year.
Code
#HXGFM-8P2L6
With a check character
#HXGFM-8P2L6*W
Short form
8P2L6
Cell centre
40.408900, -3.707489
Cell size
2.56 m by 2.60 m
City
Madrid
Region
Madrid
Country
Spain

How to give this address

On a sign, a form or a delivery note

The whole code, #HXGFM-8P2L6. It needs nothing else: no city, no street, no network to read it back.

Said aloud, in Madrid

El Rastro 8P2L6: 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 4.1 km east or west of El Rastro. 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

#HXGFM-8P2L6*W. 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 40.7 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. HXGFMetropolitan area40 km by 40.7 km
  2. HXGFMDistrict8 km by 8.14 km
  3. HXGFM8Suburb1.6 km by 1.63 km
  4. HXGFM8PA few streets320 m by 325 m
  5. HXGFM8P2Building64 m by 65.1 m
  6. HXGFM8P2LEntrance12.8 m by 13 m
  7. HXGFM8P2L6Doorway2.56 m by 2.6 m

More in Spain

Place and region from Wikidata, described on Wikipedia; city from GeoNames, under CC BY 4.0.