Charlotte Amalie

What the code says

The Grid Point Code for Charlotte Amalie is #GHTX3-K55C4. It names a cell 2.56 m north to south and 3.25 m east to west, centred on 18°20'30.85"N, 64°55'50.51"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 Charlotte Amalie, near its centre, and Charlotte Amalie is the capital of U.S. Virgin Islands.

Code

#GHTX3-K55C4

With a check character

#GHTX3-K55C4*N

Short form

K55C4

Cell centre

18.341902, -64.930698

Cell size

2.56 m by 3.25 m

Region

Saint Thomas Island

Country

U.S. Virgin Islands

Population

20,000

How to give this address

On a sign, a form or a delivery note

The whole code, #GHTX3-K55C4. It needs nothing else: no city, no street, no network to read it back.

Said aloud, in Saint Thomas Island

Charlotte Amalie K55C4: 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 Charlotte Amalie. 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

#GHTX3-K55C4*N. 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. XGHTXMetropolitan area40 km by 50.7 km
2. 3GHTX3District8 km by 10.1 km
3. KGHTX3KSuburb1.6 km by 2.03 km
4. 5GHTX3K5A few streets320 m by 406 m
5. 5GHTX3K55Building64 m by 81.1 m
6. CGHTX3K55CEntrance12.8 m by 16.2 m
7. 4GHTX3K55C4Doorway2.56 m by 3.25 m