grid-reference
There are 2 repositories under grid-reference topic.
The-Osint-Toolbox/Geolocation-OSINT
Improve you Geolocation skills, with this ilist of resources.
clozanoruiz/sgo
A set of methods focused in performing the OSGB36/ETRS89 transformation (Great Britain and the Isle of Man only) by using the Ordnance Survey's OSTN15/OSGM15 transformation model. Calculation of distances and areas from sets of points defined in any of the supported Coordinated Systems is also available.