Saint Peter Port

What the code says

The Grid Point Code for Saint Peter Port is #R0DCM-TJD98. It names a cell 2.56 m north to south and 2.22 m east to west, centred on 49°27'35.34"N, 2°32'06.99"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 Saint Peter Port, near its centre, and Saint Peter Port is the capital of Guernsey.

Code

#R0DCM-TJD98

With a check character

#R0DCM-TJD98*K

Short form

TJD98

Cell centre

49.459818, -2.535276

Cell size

2.56 m by 2.22 m

Region

St Peter Port

Country

Guernsey

Population

16,488

How to give this address

On a sign, a form or a delivery note

The whole code, #R0DCM-TJD98. It needs nothing else: no city, no street, no network to read it back.

Said aloud, in St Peter Port

Saint Peter Port TJD98: 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 3.5 km east or west of Saint Peter Port. 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

#R0DCM-TJD98*K. 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 34.7 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. CR0DCMetropolitan area40 km by 34.7 km
2. MR0DCMDistrict8 km by 6.95 km
3. TR0DCMTSuburb1.6 km by 1.39 km
4. JR0DCMTJA few streets320 m by 278 m
5. DR0DCMTJDBuilding64 m by 55.6 m
6. 9R0DCMTJD9Entrance12.8 m by 11.1 m
7. 8R0DCMTJD98Doorway2.56 m by 2.22 m