2018-01-31 43 19

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Wed 31 Jan 2018 in Prijepolje, Serbia:
43.3820538, 19.4510360

peeron geohashing.info google osm bing/os kml crox


Half way between and 11.5 km above Krnjača and Jabuka, Serbia, flying at around 800 km/h. Thanks, Ryanair - you nailed this one.




All my journeys by air seek the Air_geohash_achievement. The 10 arc second rule means you need to be under 310 metres from the hashpoint. My napkin aproximath suggests there's a 0.5% chance of meeting this goal crossing one graticule. On a mid length flight you might cross 50 graticules so now there's a 25% chance of success. Frequent flyers will certainly succeed.


I had programmed the decimal parts of the coordinates into my Garmin eTrex 20. Every 10 to 15 minutes I re-programmed the graticule coordinates and watched the distances fall and rise again. In 43,19 the distance was dropping rapidly and after each screen update I was grabbing the image. The best screen shot was at 123 metres from the hashpoint, well within the requirements.

A bit of post-processing in Google Earth confirmed the result.

The eTrex 20 lacks a barometric altimeter so you get true altitude in an aircraft and not the cabin pressure altitude.



Sourcerer earned the Air geohash achievement
by reaching the (43, 19) geohash on 2018-01-31 by Boeing 737 800, attaining the rank of passenger.

Commercial flights travel as fast as they are permitted by air traffic control or by the air frame limits.

Sourcerer earned the Speed racer achievement
by passing through the (43, 19) geohash on 2018-01-31 at 800 km/h.
Sourcerer earned the Border geohash achievement
by crossing the Cyprus, Turkey, Greece, Bulgaria, Serbia, Croatia, Slovenia, Austria, Germany, Belgium and England border on 2018-01-31 to reach the (43, 19) geohash.
Sourcerer earned the Juggernaut achievement
by reaching a geohash in a straight line (with a deviation of barely 1:53) on 2018-01-31.
Sourcerer earned the Public transport geohash achievement
by reaching the (43, 19) geohash on 2018-01-31 via Ryanair 737 800.
Sourcerer earned the Multihash Achievement
by reaching 2 hash points on 2018-01-31. It's a Double Hash.
Sourcerer earned the Last double-man standing achievement
by being the the only hasher world-wide to go on a geohashing expedition on 2018-01-31.
Sourcerer earned the Virgin Graticule Achievement
by being the first to reach any hashpoint in the (43, 19) graticule, here, on 2018-01-31.

Did Sourcerer drag along the other 180 passengers and crew on the flight?

Expeditions and Plans

Prijepolje, Serbia Sourcerer Half way between and 11.5 km above Krnjača and Jabuka, Serbia, flying at ar...
Norwich, United Kingdom Sourcerer A field perimeter footpath at Rumburgh, Suffolk UK.

Update this list.

Sourcerer's Expedition Links[edit]

2018-01-03 39 27 - 2018-01-31 43 19 - 2018-01-31 52 1 - KML file download of Sourcerer's expeditions for use with Google Earth.