User:David Souther/sandbox/Main Page

From Geohashing


Welcome to the Geohashing Community Wiki. Geohashing is a Spontaneous Adventure Generator, brought to you by the xkcd webcomic.
The Algorithm, as shown in xkcd comic #426.

xkcd comic #426, published on 21 May 2008, contains an algorithm that generates random coordinates around the world every day. Everyone in a given region gets the same set of coordinates. As such, these coordinates can be used as destinations for adventures, à la Geocaching, or for local meetups.

For a little more interactive discussion, consider joining the #geohashing IRC channel on Foonetic.

How it works

Play with the coordinate calculator at All coordinates refer to the WGS84 datum.

Every day, the algorithm generates a new set of coordinates for each 1°×1° latitude/longitude zone (known as a graticule) in the world. They are randomly placed -- they could be in the forest, in a city, on a mountain, or even in the middle of a lake! You can use this wiki to document the daily coordinates (geohashes) you've been to.

Unless you can accurately predict the stock market down to the penny, you can't figure out what the coordinates will be ahead of time. You can first calculate a weekday's coordinates at about 09:30 US Eastern Time, and on Friday you can calculate the coordinates for each day that weekend.

When visiting geohash locations, please respect the area you are visiting. Absolutely do not litter or otherwise disturb the natural integrity of the area. However, if possible, creating some kind of a marker out of nearby materials (i.e. cairn of stones, blair-witch-style 'stick figures', etc.) is encouraged.

Disclaimer: When any coordinates generated by the Geohashing algorithm fall within a dangerous area, are inaccessible, or would require illegal trespass, DO NOT attempt to reach them. Please research each potential location before attempting to access it. You are expected to use proper judgment in all cases and are solely responsible for your own actions. See more guidelines.

Official xkcd meetups

Rhonda, Robyn and Wade at the 25 April 2009 coordinates for Vancouver, BC, Canada

Official xkcd meetups happen every Saturday afternoon at 4:00 p.m.(*) at that day’s normal geohash coordinates. It is considered a Saturday meetup if you are there at 4:00 p.m. or if you meet people, but you are most likely to encounter other readers of xkcd if you go at the designated time. Bring games!

You're encouraged to geohash on any day of the week that the coordinates are accessible to you, but if you attempt one meetup all week, make a little extra effort to have it be on Saturday. All meetups start at 4:00 p.m. or as designated on the graticule page.

There's even an achievement for making it to 100 Saturday meetups.

*In some areas, 4:00pm is too close to sunset during the winter, so earlier meetups are often more appropriate. See individual graticule pages for local conventions.

Server Time: Tuesday 29 September 2020, 23:00 (UTC) – Refresh this page


The coordinates for the next Saturday meetups, scheduled for 3 October 2020, will be based on the Dow’s opening price published at 09:30 EDT (13:30 UTC) on Friday 2 October. See to convert this time to your local time zone.

Date West of –30° East of –30°
Thu 10 Jul 2008 .3372663, .9466538 .9778606, .9410166
Wed 9 Jul 2008 .3372663, .9466538 .9778606, .9410166
Tue 8 Jul 2008 .3372663, .9466538 .9778606, .9410166
Mon 7 Jul 2008 .3372663, .9466538 .9778606, .9410166
Sun 6 Jul 2008 .3372663, .9466538
Sat 5 Jul 2008 .3372663, .9466538
Fri 4 Jul 2008 .3372663, .9466538
Thu 3 Jul 2008 .3372663, .9466538 .9778606, .9410166

View expedition archives for: September 2020 | August 2020 | July 2020 | More...

Find others in your area!

Want to find geohashers in your local area? See Category:Active graticules for a list of graticules with active users in them.
  • Don't see your home area? Follow the format and create a page for it! We'd love to have you!
  • An interactive map is available for Google Earth or on Google Maps.
  • You can also attach your photos to this Google Maps layer.


A full list of reference and practical implementations can be found on the Implementations page.

Gallery of Recent Expeditions