Postojna Cave

What the code says

The Grid Point Code for Postojna Cave is #PW4C2-X691K. It names a cell 2.56 m north to south and 2.38 m east to west, centred on 45°46'57.90"N, 14°12'13.15"E, 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

Karst cave system in Slovenia

Code

#PW4C2-X691K

With a check character

#PW4C2-X691K*1

Short form

X691K

Cell centre

45.782749, 14.203653

Cell size

2.56 m by 2.38 m

Region

Municipality of Postojna

Country

Slovenia

How to give this address

On a sign, a form or a delivery note

The whole code, #PW4C2-X691K. It needs nothing else: no city, no street, no network to read it back.

Said aloud, in Municipality of Postojna

Postojna Cave X691K: 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 3.7 km east or west of Postojna 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

#PW4C2-X691K*1. 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 37.3 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.

1. CPW4CMetropolitan area40 km by 37.3 km
2. 2PW4C2District8 km by 7.45 km
3. XPW4C2XSuburb1.6 km by 1.49 km
4. 6PW4C2X6A few streets320 m by 298 m
5. 9PW4C2X69Building64 m by 59.6 m
6. 1PW4C2X691Entrance12.8 m by 11.9 m
7. KPW4C2X691KDoorway2.56 m by 2.38 m

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