Great Blue Hole
Belize DistrictBelize
- With a code
#GL1L3-CH7NM- Said aloud
- Great Blue Hole
CH7NM
What the code says
The Grid Point Code for Great Blue Hole is #GL1L3-CH7NM. It names a cell 2.56 m north to south and 3.26 m east to west, centred on 17°18'56.02"N, 87°32'04.00"W, 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
- Submarine sinkhole off the coast of Belize
- Code
#GL1L3-CH7NM- With a check character
#GL1L3-CH7NM*7- Short form
CH7NM- Cell centre
- 17.315562, -87.534444
- Cell size
- 2.56 m by 3.26 m
- Region
- Belize District
- Country
- Belize
How to give this address
- On a sign, a form or a delivery note
The whole code,
#GL1L3-CH7NM. It needs nothing else: no city, no street, no network to read it back.- Said aloud, in Belize District
Great Blue Hole CH7NM: 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 5.1 km east or west of Great Blue Hole. 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
#GL1L3-CH7NM*7. 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 51 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.
- GL1LMetropolitan area40 km by 51 km
- GL1L3District8 km by 10.2 km
- GL1L3CSuburb1.6 km by 2.04 km
- GL1L3CHA few streets320 m by 408 m
- GL1L3CH7Building64 m by 81.6 m
- GL1L3CH7NEntrance12.8 m by 16.3 m
- GL1L3CH7NMDoorway2.56 m by 3.26 m