La Merced Market

Mexico CityMexico

Without a code: La Merced Market, Mexico City, and then directions
With a code: #GD36T-T1TDN
Said aloud: La Merced Market T1TDN

This code is one spot in La Merced Market, a cell 2.56 m by 3.23 m. Every stall front and doorway in it has a code of its own.

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What the code says

The Grid Point Code for La Merced Market is #GD36T-T1TDN. It names a cell 2.56 m north to south and 3.23 m east to west, centred on 19°25'33.28"N, 99°07'26.60"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: Traditional food market in Mexico City
Code: #GD36T-T1TDN
With a check character: #GD36T-T1TDN*W
Short form: T1TDN
Cell centre: 19.425911, -99.124055
Cell size: 2.56 m by 3.23 m
City: Mexico City
Region: Mexico City
Country: Mexico

How to give this address

On a sign, a form or a delivery note: The whole code, #GD36T-T1TDN. It needs nothing else: no city, no street, no network to read it back.
Said aloud, in Mexico City: La Merced Market T1TDN: 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 5.0 km east or west of La Merced Market. 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: #GD36T-T1TDN*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 50.4 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.

GD36Metropolitan area40 km by 50.4 km
GD36TDistrict8 km by 10.1 km
GD36TTSuburb1.6 km by 2.02 km
GD36TT1A few streets320 m by 403 m
GD36TT1TBuilding64 m by 80.6 m
GD36TT1TDEntrance12.8 m by 16.1 m
GD36TT1TDNDoorway2.56 m by 3.23 m

More in Mexico

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