São Tomé

What the code says

The Grid Point Code for São Tomé is #JPTX0-NF747. It names a cell 2.56 m north to south and 3.42 m east to west, centred on 0°20'15.26"N, 6°43'47.67"E, 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 São Tomé, near its centre, and São Tomé is the capital of São Tomé and Príncipe.

Code

#JPTX0-NF747

With a check character

#JPTX0-NF747*N

Short form

NF747

Cell centre

0.337571, 6.729907

Cell size

2.56 m by 3.42 m

Region

São Tomé Island

Country

São Tomé and Príncipe

Population

53,300

How to give this address

On a sign, a form or a delivery note

The whole code, #JPTX0-NF747. It needs nothing else: no city, no street, no network to read it back.

Said aloud, in São Tomé Island

São Tomé NF747: 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 5.3 km east or west of São Tomé. 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

#JPTX0-NF747*N. 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 53.4 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. XJPTXMetropolitan area40 km by 53.4 km
2. 0JPTX0District8 km by 10.7 km
3. NJPTX0NSuburb1.6 km by 2.14 km
4. FJPTX0NFA few streets320 m by 427 m
5. 7JPTX0NF7Building64 m by 85.5 m
6. 4JPTX0NF74Entrance12.8 m by 17.1 m
7. 7JPTX0NF747Doorway2.56 m by 3.42 m