Blue Stakes uses GIS data provided by the State of Utah’s Geospatial Resource Center (UGRC) in its mapping system. UGRC compiles official map data from local government sources, including city, county, and state agency mapping departments. The coordinate system and datum used for all Blue Stakes map layers is unprojected latitude/longitude NAD83. To view UGRC’s base map viewer, click here. You can reference this map prior to contacting Blue Stakes if you need to determine the name of a road, find latitude/longitude coordinates for your dig site, etc. Please keep in mind that you must provide an address that is physically posted in the field when submitting a request for marking.