Geodetic datum Wikipedia open wikipedia design. A geodetic datum is used to locate a given position when using a set of reference, such as a map. That way a set of coordinates might reference an exact location on the map. This short article can be made longer. You can help Wikipedia by adding to it. This page is based on a Wikipedia article written by contributors (read/edit).Text is available under the CC BY-SA 4.0 license; additional terms may apply. Images, videos and audio are available under their respective licenses.