The tutorial provides a comprehensive guide on building a real-time JavaScript chat application that connects users based on their relative location using geohashing. It explains how reducing the accuracy of latitude and longitude coordinates can expand the coverage area for proximity-based connections, allowing users to be grouped by location. The tutorial delves into the technical aspects of geohashing, including the use of different resolution levels, referred to as "zoom" levels, to manage the granularity of location data and optimize the chat area. By utilizing the PubNub platform, developers can bypass the complexities of building their own APIs to handle real-time GPS data transmission, benefiting from PubNub's scalable and reliable infrastructure. The guide also highlights the importance of using PubNub's APIs for efficient, secure, and fast data delivery, and it provides resources for further exploration of geolocation services with PubNub.