Jamestown

What the code says

The Grid Point Code for Jamestown is #9N715-T0HL3. It names a cell 2.56 m north to south and 3.29 m east to west, centred on 15°55'29.61"S, 5°43'05.43"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 Jamestown, near its centre, and Jamestown is the capital of Saint Helena.

Code

#9N715-T0HL3

With a check character

#9N715-T0HL3*9

Short form

T0HL3

Cell centre

-15.924891, -5.718175

Cell size

2.56 m by 3.29 m

Country

Saint Helena

Population

637

How to give this address

On a sign, a form or a delivery note

The whole code, #9N715-T0HL3. It needs nothing else: no city, no street, no network to read it back.

Said aloud, in Saint Helena

Jamestown T0HL3: 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 Jamestown. 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

#9N715-T0HL3*9. 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 51.4 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.

1. 19N71Metropolitan area40 km by 51.4 km
2. 59N715District8 km by 10.3 km
3. T9N715TSuburb1.6 km by 2.06 km
4. 09N715T0A few streets320 m by 411 m
5. H9N715T0HBuilding64 m by 82.2 m
6. L9N715T0HLEntrance12.8 m by 16.4 m
7. 39N715T0HL3Doorway2.56 m by 3.29 m