Coordinate Systems, Datums, and Zones For Hydrographers and GIS Technicians is a three-video series that provides a working knowledge of why hydrographers or GIS technicians use and how to use coordinate systems. This introduction to Geodesy is focused on the surveyor/operator providing mission-based information on how to coordinate systems work and providing real-world examples in survey software without becoming overly technical. While available as a separate series, these three videos are also included in the complete Hydrographer's Toolbox video series.