Grid Point Code

Play

Three Sisters

near KatoombaNew South WalesAustralia

With a code
#6LLM9-GJK5M
Said aloud
Three Sisters GJK5M

Open in the playground

What the code says

The Grid Point Code for Three Sisters is #6LLM9-GJK5M. It names a cell 2.56 m north to south and 2.84 m east to west, centred on 33°44'07.97"S, 150°18'52.02"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
Rock formation in the Blue Mountains of New South Wales, Australia
Code
#6LLM9-GJK5M
With a check character
#6LLM9-GJK5M*6
Short form
GJK5M
Cell centre
-33.735548, 150.314450
Cell size
2.56 m by 2.84 m
Region
New South Wales
Country
Australia

How to give this address

On a sign, a form or a delivery note

The whole code, #6LLM9-GJK5M. It needs nothing else: no city, no street, no network to read it back.

Said aloud, in New South Wales

Three Sisters GJK5M: 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 4.4 km east or west of Three Sisters. 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

#6LLM9-GJK5M*6. 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 44.4 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. 6LLMMetropolitan area40 km by 44.4 km
  2. 6LLM9District8 km by 8.89 km
  3. 6LLM9GSuburb1.6 km by 1.78 km
  4. 6LLM9GJA few streets320 m by 355 m
  5. 6LLM9GJKBuilding64 m by 71.1 m
  6. 6LLM9GJK5Entrance12.8 m by 14.2 m
  7. 6LLM9GJK5MDoorway2.56 m by 2.84 m

More in Australia

Place and region from Wikidata, described on Wikipedia; nearby town from GeoNames, under CC BY 4.0.