Natal

Rio Grande do NorteBrazil

With a code: #9T5M1-DC4M0
Said aloud: Natal DC4M0

What the code says

The Grid Point Code for Natal is #9T5M1-DC4M0. It names a cell 2.56 m north to south and 3.40 m east to west, centred on 5°47'42.03"S, 35°12'33.97"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 Natal, near its centre.

Code: #9T5M1-DC4M0
With a check character: #9T5M1-DC4M0*T
Short form: DC4M0
Cell centre: -5.795009, -35.209436
Cell size: 2.56 m by 3.40 m
Region: Rio Grande do Norte
Country: Brazil
Population: 896,708

How to give this address

On a sign, a form or a delivery note: The whole code, #9T5M1-DC4M0. It needs nothing else: no city, no street, no network to read it back.
Said aloud, in Rio Grande do Norte: Natal DC4M0: 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 5.3 km east or west of Natal. 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: #9T5M1-DC4M0*T. 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 53.2 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.

9T5MMetropolitan area40 km by 53.2 km
9T5M1District8 km by 10.6 km
9T5M1DSuburb1.6 km by 2.13 km
9T5M1DCA few streets320 m by 425 m
9T5M1DC4Building64 m by 85.1 m
9T5M1DC4MEntrance12.8 m by 17 m
9T5M1DC4M0Doorway2.56 m by 3.4 m

More in Brazil

City, region and population from GeoNames, under CC BY 4.0.