Cali

Valle del Cauca DepartmentColombia

With a code: #GW64F-J74K2
Said aloud: Cali J74K2

What the code says

The Grid Point Code for Cali is #GW64F-J74K2. It names a cell 2.56 m north to south and 3.41 m east to west, centred on 3°25'49.90"N, 76°31'11.68"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 Cali, near its centre.

Code: #GW64F-J74K2
With a check character: #GW64F-J74K2*F
Short form: J74K2
Cell centre: 3.430529, -76.519910
Cell size: 2.56 m by 3.41 m
Region: Valle del Cauca Department
Country: Colombia
Population: 2,392,877

How to give this address

On a sign, a form or a delivery note: The whole code, #GW64F-J74K2. It needs nothing else: no city, no street, no network to read it back.
Said aloud, in Valle del Cauca Department: Cali J74K2: 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 Cali. 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: #GW64F-J74K2*F. 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 53.3 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.

GW64Metropolitan area40 km by 53.3 km
GW64FDistrict8 km by 10.7 km
GW64FJSuburb1.6 km by 2.13 km
GW64FJ7A few streets320 m by 427 m
GW64FJ74Building64 m by 85.3 m
GW64FJ74KEntrance12.8 m by 17.1 m
GW64FJ74K2Doorway2.56 m by 3.41 m

More in Colombia

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