CTA’s WAVE committee published CTA-5009, Fast and Readable Geographical Hashing. This document exists to remediate that. It describes the practice as it exists at the time of writing and provides general, straightforward algorithms for understanding and communicating with Geohashes. It also exists to serve as a stable reference document for a few IANA registrations. To that end, the algorithm documented in the “Technical description” section of the Geohash Wikipedia entry is described here. This document does not describe all the usages, limitations, or geographic and mathematical details for Geohashes because those are well described by the references.