*[http://www.colorado.edu/geography/gcraft/notes/coordsys/coordsys_f.html A list of coordinate systems] – by Prof. Peter H. Dana at the Univ. of Colorado
*[http://earth-info.nga.mil/GandG/coordsys/grids/referencesys.html Grids and Reference Systems], by [[National Geospatial-Intelligence Agency|NGA]].
* [https://geographiclib.sourceforge.io GeographicLib] provides a utility GeoConvert (with source code) for conversions between geographic, [[Universal Transverse Mercator|UTM]], [[Universal Polar Stereographic|UPS]], and MGRS. Here is an [https://geographiclib.sourceforge.io/cgi-bin/GeoConvert online version of GeoConvert].
* [https://www.gridscout.net/ GridScout], a command-line tool for querying the [[Google Maps API]] and displaying results in MGRS coordinates.
* Army Study Guide: [http://www.armystudyguide.com/content/Prep_For_Basic_Training/Prep_for_basic_land_navigation/locate-a-point-using-the-.shtml Locate a point using the US Army Military Grid Reference System (MGRS)]
* [http://www.maps.pixelis.es/ Web application to locate GPS coordinates in MGRS, UTM, DMS and decimal format] {{es icon}}
* [https://mappingsupport.com/p2/gissurfer.php?center=15SUT28497324&zoom=4&basemap=USA_basemap GISsurfer], a general purpose web map with a MGRS grid and more.
