Harrison's Cave

What the code says

The Grid Point Code for Harrison's Cave is #H9H5J-2N109. It names a cell 2.56 m north to south and 3.33 m east to west, centred on 13°11'06.65"N, 59°34'28.35"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

Cave in Barbados

Code

#H9H5J-2N109

With a check character

#H9H5J-2N109*P

Short form

2N109

Cell centre

13.185181, -59.574543

Cell size

2.56 m by 3.33 m

Region

Saint Thomas

Country

Barbados

How to give this address

On a sign, a form or a delivery note

The whole code, #H9H5J-2N109. It needs nothing else: no city, no street, no network to read it back.

Said aloud, in Saint Thomas

Harrison's Cave 2N109: 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 5.2 km east or west of Harrison's Cave. 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

#H9H5J-2N109*P. 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 52 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. 5H9H5Metropolitan area40 km by 52 km
2. JH9H5JDistrict8 km by 10.4 km
3. 2H9H5J2Suburb1.6 km by 2.08 km
4. NH9H5J2NA few streets320 m by 416 m
5. 1H9H5J2N1Building64 m by 83.2 m
6. 0H9H5J2N10Entrance12.8 m by 16.6 m
7. 9H9H5J2N109Doorway2.56 m by 3.33 m

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