Run make on a cloned directory to generate worldwide label centroids and outlines of MGRS Grid Zone Designators (GZDs, e.g., "60Z") and 100km zones (e.g., 60ZDA) polygons.
Requires python 3.6+, a compatible installation of 7-zip, gzip, GDAL, OGR, and make. This repository was created and tested on Windows with an eye torwards Linux portability provided minimal adjustments.