Matterhorn

What the code says

The Grid Point Code for Matterhorn is #PXRHN-G4TPG. It names a cell 2.56 m north to south and 2.38 m east to west, centred on 45°58'34.96"N, 7°39'30.97"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

Mountain in the Pennine Alps on the border between Switzerland and Italy

Code

#PXRHN-G4TPG

With a check character

#PXRHN-G4TPG*4

Short form

G4TPG

Cell centre

45.976378, 7.658604

Cell size

2.56 m by 2.38 m

Region

Canton of Valais

Country

Switzerland

How to give this address

On a sign, a form or a delivery note

The whole code, #PXRHN-G4TPG. It needs nothing else: no city, no street, no network to read it back.

Said aloud, in Canton of Valais

Matterhorn G4TPG: 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 Matterhorn. 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

#PXRHN-G4TPG*4. 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 37.1 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. HPXRHMetropolitan area40 km by 37.1 km
2. NPXRHNDistrict8 km by 7.43 km
3. GPXRHNGSuburb1.6 km by 1.49 km
4. 4PXRHNG4A few streets320 m by 297 m
5. TPXRHNG4TBuilding64 m by 59.4 m
6. PPXRHNG4TPEntrance12.8 m by 11.9 m
7. GPXRHNG4TPGDoorway2.56 m by 2.38 m

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