Dunn's River Falls

What the code says

The Grid Point Code for Dunn's River Falls is #GG253-LWN49. It names a cell 2.56 m north to south and 3.24 m east to west, centred on 18°24'57.01"N, 77°08'17.01"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

Waterfall in Jamaica

Code

#GG253-LWN49

With a check character

#GG253-LWN49*T

Short form

LWN49

Cell centre

18.415837, -77.138058

Cell size

2.56 m by 3.24 m

Region

Middlesex County

Country

Jamaica

How to give this address

On a sign, a form or a delivery note

The whole code, #GG253-LWN49. It needs nothing else: no city, no street, no network to read it back.

Said aloud, in Middlesex County

Dunn's River Falls LWN49: 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 5.1 km east or west of Dunn's River Falls. 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

#GG253-LWN49*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 50.7 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. 5GG25Metropolitan area40 km by 50.7 km
2. 3GG253District8 km by 10.1 km
3. LGG253LSuburb1.6 km by 2.03 km
4. WGG253LWA few streets320 m by 406 m
5. NGG253LWNBuilding64 m by 81.1 m
6. 4GG253LWN4Entrance12.8 m by 16.2 m
7. 9GG253LWN49Doorway2.56 m by 3.24 m

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