This document provides an overview of the erLocator application, which allows users to efficiently find other nearby users on a map without performing direct distance calculations. It stores user locations grouped by region using a geohashing algorithm. The no-SQL Redis backend stores these regions and user data. A simple Erlang backend interfaces with Redis via Redo and exposes an API through the Mochiweb web server. Documentation is generated with eDoc. Builds are managed by Rebar. The open source code is hosted on GitHub under the MIT license.