![]() In GIS, specifying WGS84 as the datum means you can use GPS data directly. Anyone can use the following live GISsurfer map to help learn about UTM coordinates. ![]() It primarily allows a definition of what you mean by the co-ordinate origin and the orientation of the axes of the reference frame, together with the reference ellipsoid you are using. This map with a UTM grid will work in most browsers on most devices including cell phones. The map is displayed by GISsurfer which is a general purpose web map based on the Leaflet map API (Application Program Interface). Using UTM specifies how lat/long locations are represented as E/N co-ordinates in the database and also on the screen or a printed map. If you want to use anything other than latitude/longitude to specify locations, you need a map projection. WGS84 allows you to have a datum, in the full meaning of the term, and this is projected using the map projection.
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