v0.1 2023-05-05 'Couscous'
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* compute Geohash[1] character hash from wgs84[2] lat/lon
* compute wgs84 lat/lon/delta_lat/delta_lon from geohash character hash
* a RFC3875 CGI producing GPX[3]
* have a DOAP[4] rdf self-description

[1] https://en.wikipedia.org/wiki/Geohash
[2] https://en.wikipedia.org/wiki/WGS84
[3] http://www.topografix.com/gpx.asp
[4] https://en.wikipedia.org/wiki/DOAP